Malicious PDF — malware analysis report

Static analysis result for SHA-256 595c6c312f4b4ded…

MALICIOUS

PDF

95.4 KB Created: 2021-04-04 12:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cfa4782377c2a9afed1a6f2a08dd3a05 SHA-1: 89dd0faef84fbf07e9fb7853a5f7f199412f736e SHA-256: 595c6c312f4b4deda124ccba426738bcc59b99a2f98ed67d8b524f1927af5580
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=friedrich+nietzsche+god+is+dead+book+pdf PDF link annotation
    • https://cdn.sqhk.co/jevamivuvugi/MhjGWjd/multi-_strike_pokertm_1_free_video_poker.pdfIn PDF document text
    • http://shoes-storie.club/whisky_words_and_a_shovel_iih27yh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5fe39a9b120f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422659/normal_5ffcd1f77340b.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/jizevazexoje.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/zovolaguba-diguxexuno-mufedidu.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/masepoworilewesezowortramn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fd6abb59fe35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406809/normal_6016753bf1c03.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/aWlw4hj/papers_grade_please_game_online.pdfIn PDF document text
    • https://lufegema.weebly.com/uploads/1/3/4/1/134132410/b691f4.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/kudurijijebuki.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/VifhdGd/can_you_cross_the_bridge_riddle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374540/normal_5fef11d9832d0.pdfIn PDF document text
    • https://wujewogo.weebly.com/uploads/1/3/4/5/134586314/7496de2c5acfc.pdfIn PDF document text
    • http://best-store.club/28812295346s7w2q.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/2251f019-75f7-4585-b7c0-518393001cef/98894754458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ebb96d-a24b-4f53-bdd6-14026583ccaa/38368944874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468bf742-d7b8-47e8-a4c9-607ca44169bf/97100152151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b864643-17a9-4795-a10c-5ec6cd0fb0ba/61834741485.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/nutokanuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/lizuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/fibezinapawi.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 5596 bytes
SHA-256: ed273cd2c97935d93218b9cc0f0bbd1bbcb4b89fdaa5c2099a29f0edecd04ca7
font_01_sfnt_off000145fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FE 12276 bytes
SHA-256: d29dd26fa65b7caf27d0ed0caec575af063b7dad00451b8b0840789dc861e557