Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ead81ee992464fc…

MALICIOUS

PDF

123.2 KB Created: 2021-03-24 16:17:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f7293c895bb1c1bb6a05fe3bc7c8ab50 SHA-1: 5cf402b217c5da7a098445473b6ac676eed0aec7 SHA-256: 3ead81ee992464fc6f101e45923f716312b1b9b61286066939a96eef4ee73ebb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO abuse tactic. The primary URL, 'https://pelibifir.ru/wix?keyword=ap+chemistry+empirical+and+molecular+formula+worksheet+answers', is presented as a worksheet answer key, likely to entice clicks. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/wix?keyword=ap+chemistry+empirical+and+molecular+formula+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/ziveluki/hqjgpid/tisupavenatelamibo.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/monofezusodibofizyalbx.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/sewejidewumeja-bubenu-vivaxi-rudubafu.pdfIn PDF document text
    • http://mosdendy.store/fastest_way_to_get_rid_of_poison_ivy_plantey4qi.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/3983687.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/femetig.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/xoxudewagoxe.pdfIn PDF document text
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/konazezofaseke.pdfIn PDF document text
    • http://igbusinessabouthelp.com/green_smoothie_recipes_with_spinach_and_avocadokojs6.pdfIn PDF document text
    • https://cdn.sqhk.co/rodisukipi/iaPnjap/tunudaxurewepeni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/825822e4-5d49-405c-be11-d52864fa4551/tozivakadamajulijarozit.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_fc35e304f92a421e8e7f66a6ef066350.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_88fa935a175847cdb56429640624dd0e.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_1bfdecfeae3046d3b12be60159ee6601.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23d753b-9c14-4f82-b473-c5b77ccdcaaf/where_do_you_first_start_losing_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d08bc5-9018-427d-b2fe-cd4a4520f21f/pegakaxupinuwepuvinu.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_c4f35ccc3f6d45c38cc096ec1d702a65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6bcbc6-e638-4019-a168-86665f40610f/vemev.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_7bc16ba648cc47ca95939555f3b13481.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ce3a7e-1c86-4d53-8495-831e8ffe7e38/51033661668.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_21370aec60054e73aab85c64e48e92b4.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_5ba58f7b4a1e424fb3b72ecb5b96df46.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A94 6460 bytes
SHA-256: a6cec322654722ec75f56a002c10669cf604f1fa9523864db3634a6461fbd806
font_01_sfnt_off00015a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A58 3960 bytes
SHA-256: b7cbe3a9a7fc310fe6389fdbee2822653a5352878e19bdb1ed262972498fcbdb
font_02_sfnt_off0001686b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686B 5640 bytes
SHA-256: 518ac8340439bfadbb6e3794d08e0f57cd597cafb8fc8df851ae4fb7ef876e05
font_03_sfnt_off00017b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B8C 17072 bytes
SHA-256: 1602bd6554d90b41387c2fd99a43b065f36e30ab2cdc0e685226b58ab4dc84ad
font_04_sfnt_off0001b11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B11C 17748 bytes
SHA-256: 7099ddf3a682562df8f89bc22b53b53299f37bcbf69f102b2f81e8ed8e70f105
font_05_sfnt_off0001cb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB58 6268 bytes
SHA-256: 4e9b96c9ba0db9d900f5bf22e482dbd943deef9ae297ddffbd18ab7cf8974b98

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