Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8bf3a76c7832e1…

MALICIOUS

PDF

68.9 KB Created: 2021-05-25 09:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f3216a683677961e5331e3935e68afe4 SHA-1: 0e2ff5da9577fa48cde4176e9f2228310cf63ed3 SHA-256: 3d8bf3a76c7832e1d23d88b642e9e7074a13bb1404edfba6e1f14c9c556f6be6
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary malicious URL identified is https://soxebez.ru/strik, which is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=let+us+c+solutions+16th+edition+github PDF link annotation
    • https://zanubago.weebly.com/uploads/1/3/4/8/134886268/rinawubetogopefos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_602faa67e5dd3.pdfIn PDF document text
    • https://beziremisolexew.weebly.com/uploads/1/3/4/6/134656792/kanelapiwe.pdfIn PDF document text
    • https://xenuwupe.weebly.com/uploads/1/3/5/3/135329542/walekakorapofopu.pdfIn PDF document text
    • https://sekatuxu.weebly.com/uploads/1/3/4/8/134894727/15571d2842aab.pdfIn PDF document text
    • https://zuverefexogi.weebly.com/uploads/1/3/4/3/134316215/9e7db6c1f76d2.pdfIn PDF document text
    • https://josifajine.weebly.com/uploads/1/3/4/7/134761936/rugex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_6053130262fc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_60463f390af48.pdfIn PDF document text
    • https://wobadudubabu.weebly.com/uploads/1/3/4/5/134510413/1f5730c3763ea9f.pdfIn PDF document text
    • https://gibuximo.weebly.com/uploads/1/3/4/6/134665594/viripotepef-manixex-surigowukolajal-fepufeneli.pdfIn PDF document text
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/03b46.pdfIn PDF document text
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/7071677.pdfIn PDF document text
    • https://bemijeze.weebly.com/uploads/1/3/5/3/135302335/f154e.pdfIn PDF document text
    • https://sifurimunudop.weebly.com/uploads/1/3/4/3/134328932/34727ea4a61271.pdfIn PDF document text
    • https://zutekavewer.weebly.com/uploads/1/3/4/5/134514418/wevuriwexobiza_nizofomef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_602b288c23be4.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/89469652-214d-4a82-a513-a467f3badda9/leredixamovutugirazixuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d648bd1-7d72-45cc-8476-e42944afaf50/how_to_repair_a_spa_tub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89b41ed-a3e9-4065-8fff-548747bd64e1/wooden_giants_in_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bb5194-1138-4ff4-b38c-c7dbfbdd074c/crpc_bare_act_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbdd4909-dacf-44bd-96e5-0fb3dceab866/2078646532.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_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 5180 bytes
SHA-256: c4e283fbc3739cde63280586ad478270932bea2b99ccb4c24368f7713c4f4df8
font_01_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 10864 bytes
SHA-256: 58dc51126abaf827f3e190e72ce15813d5d39c72c31aeddc9f48f4023b8d61ae