Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ed7b6836609de6…

MALICIOUS

PDF

83.3 KB Created: 2021-03-25 14:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4c30c21bf53275c5280543dc6ad09856 SHA-1: 64cacbfca336b7247a2d12d49d492f40ba2035a9 SHA-256: 18ed7b6836609de6b5f204830251e61b7e79ea885626350efee01405f0fac840
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL pointing to a potentially malicious resource. ClamAV and ML classifiers also flagged this PDF as malicious, specifically noting phishing and trojan characteristics. The embedded content, though heavily obfuscated, suggests an attempt to lure users to external sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=snt+tc+1a+latest+edition+pdf PDF link annotation
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/9805049.pdfIn PDF document text
    • https://rekixalegupu.weebly.com/uploads/1/3/2/7/132740488/nosite-dovosavozojer.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/metro_north_train_station_bronx.pdfIn PDF document text
    • https://nudomituge.weebly.com/uploads/1/3/4/6/134677479/8a9f10cfa682.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/13cc2.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/rudesefas.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/52a6158b.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/76c2a88523.pdfIn PDF document text
    • http://jivavesomuviz.getenjoyment.net/identifying_emotions_activities_for_adults.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/pimanujazexitobanave.pdfIn PDF document text
    • https://wekisakalew.weebly.com/uploads/1/3/4/6/134617168/8686771.pdfIn PDF document text
    • https://kepigepejabuji.weebly.com/uploads/1/3/4/3/134315220/37ebec296151d18.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://s3.amazonaws.com/votubukaxogilix/16433815050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba84ad9-a7b7-4cff-b3cd-54e5a7d47c71/the_mortal_instruments_city_of_bones_full_movie_download_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e6a164-7d66-4a26-af58-9fc87f640886/delta_36-220_type_3_miter_saw_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/john_deere_mowers_for_sale_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/vemexoxasevujamuzet.pdfIn PDF document text
    • https://8dc488cc-5c17-4bbd-bfcc-4d65d6cbc3db.filesusr.com/ugd/10b03a_17e498cd95244ba8b90ab62b1d1ca0d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f501613-44e5-471a-9265-7ac636938c2a/ruzigadujolavemopiwola.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_11b3d7845bbe40768a6aeb696411705e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/consumer_reports_magazine_online_subscription.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f579e0-bb4b-4078-b184-0a625c941ed5/beats_studio_3_wireless_launch_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e357c868-3366-4b17-89f3-8d3c5d1de22a/audio-technica_at-lp60xusbgm.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_2303b8e00ee6491d9ec76848224ba0f5.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_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 4996 bytes
SHA-256: 29f4c66a132218cfb25f9ed26053c86bf08ae2facccbab5bed380be9cb505654
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 12884 bytes
SHA-256: 6e11837c50ce0b125bf360d3678a0184bfcd302267c04c8c042178e47e30c805
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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