Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2059bb261c7e2a6…

MALICIOUS

PDF

67.7 KB Created: 2021-06-09 12:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4bee91d9fa9f0a3aaeec0130c5b2b96e SHA-1: 9eeeb29900562696489302b5f97244964fdde5c1 SHA-256: e2059bb261c7e2a616728cf44a2abe87a9a490bbc21f19e36188755ef11a66ae
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://dafemum.ru/123?utm_term=uscg+auxiliary+uniforms PDF link annotation
    • https://gimalijuvilonur.weebly.com/uploads/1/3/4/6/134619020/kizoge_perodureke_xaselanamub_wenivegipeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_60151f98af4e9.pdfIn PDF document text
    • https://pozojemiveze.weebly.com/uploads/1/3/4/6/134690114/d500f91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5fed22411bc85.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/58432cf1c20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_6016de42ea675.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/7714c7db0f867f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ff328ee9904b.pdfIn PDF document text
    • https://mitometivu.weebly.com/uploads/1/3/6/0/136094147/rokatuzasu.pdfIn PDF document text
    • https://mixowobigasobu.weebly.com/uploads/1/3/1/1/131164278/e1eb03beb2df.pdfIn PDF document text
    • https://juregirezixo.weebly.com/uploads/1/3/4/4/134401856/5017413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_604cda20284e3.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/5ea633e2-9ce8-46e2-94c0-9b3ea52d8e5a/vozababowig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b1c330-c4f7-40f0-9151-5c11dd3a68b7/how_to_register_a_business_forum_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21866a4e-ea33-4934-8a2b-15dc0c5f5a19/vaditaxuramukuxuvikemese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b6c5f5-da48-4082-8144-3d6910819b94/falusivagijojule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd23820a-964b-4af2-b655-4f788f9f8e60/49836198788.pdfIn PDF document text
    • http://suniger.pbworks.com/w/file/fetch/144744153/puguni.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144498597/83527405101.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_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 5364 bytes
SHA-256: 6dbd6da59d060371da836334368ef04638cd76ffcf799b6bfc388da105512c88
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 11156 bytes
SHA-256: 447b36fe6691bc3e243449d28966d25fb869283634cb094b321bf6d45216152e

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