Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5de3fd1f16e3615…

MALICIOUS

PDF

144.5 KB Created: 2021-04-22 09:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ae1f5029efe6a568af64e35d3159e11b SHA-1: bb3dde2bcaa165df4d0c4053087a6eed3ff59ce0 SHA-256: b5de3fd1f16e3615893b641d7ffb4b510aa19364ba5717834f5334ad7ccc868e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'Pokemon diamond walkthrough guide', likely a lure to direct users to malicious URLs such as https://xezojetit.ru/strik?utm_term=pokemon+diamond+walkthrough+guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=pokemon+diamond+walkthrough+guide PDF link annotation
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/4879442.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/pulasuk.pdfIn PDF document text
    • https://jawenovexexadu.weebly.com/uploads/1/3/4/0/134012785/sijemeta_selewotowokot_banidada_nigifof.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/408f6.pdfIn PDF document text
    • https://lomelamul.weebly.com/uploads/1/3/5/9/135994015/3c569647.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/salmos_hernandes_dias_lopes.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/sex_and_the_city_season_1_episode_12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_5004c5d616bb4bc4b6e3c5eb156561a4.pdf?index=trueIn PDF document text
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_cb05df951acd45b19073c9b9cc260938.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8844e3-2b0e-4497-9233-423f346703e4/are_nissan_frontier_trucks_good.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_ec5f1c3173ab46b0982bf9f10128f2b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d42ed7-8b60-483e-925b-67129a30d5ba/pupovazoso.pdfIn PDF document text
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_19f359ce76c140e59b470e6d440b491b.pdf?index=trueIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_579d25793ef04c43b6ab99fcf42e5860.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed39f49-1aa2-4634-8271-b71251bf58f7/examen_diagnostico_historia_de_mexico_secundaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16d31f0-c179-4808-bf3d-9c788c41d2ae/65111652742.pdfIn PDF document text
    • https://bc5d5878-7fc8-4b9f-a3e6-8b1a1bd4f47a.filesusr.com/ugd/3835dd_ef4ae4f5a3b84b39880c0e86ac8b67c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed159dc-2633-4762-808b-39b3738e932c/rureragoxe.pdfIn PDF document text
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_371844e3b779474facfb9480fa5d1305.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE10 5100 bytes
SHA-256: 6ec4573f840948bbcce7d1744e26b173775588cb52d5a914b0d2c84fc9a96a67
font_01_sfnt_off0001ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF42 11532 bytes
SHA-256: 8e7fae94e5c7673ff5e76e3dc3c2eda2ac8591b5b9621f31177351252e69de30
font_02_sfnt_off000225d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225D4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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