Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6053a717d6ca63…

MALICIOUS

PDF

72.1 KB Created: 2021-04-13 21:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 266fb15e93bef6c70eea6ae77654b3bd SHA-1: b33798a07a17a956f00ce510ebb225def47ae34f SHA-256: 7b6053a717d6ca6348cd137fd5af6acf435acf500374efa1f54dcd0491745e6d
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 0.9991

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://baarspo.ru/strik?utm_term=pokemon+leafgreen+guide+book+pdf PDF link annotation
    • http://gepozuj.iblogger.org/58063007666.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/perfect_english_grammar_past_simple_past_perfect_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_601ca3af654bc.pdfIn PDF document text
    • http://pakunobun.getenjoyment.net/phonics_learning_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_6029a26311364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_5fe878181f022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499958/normal_6061861067364.pdfIn PDF document text
    • https://wuxijize.weebly.com/uploads/1/3/4/6/134685372/ac6cf45521c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413242/normal_5ffb21152aaff.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/dabugefopoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_603f925728dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_601b014c43768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_605ee2e7743d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_605ddc8c685ed.pdfIn PDF document text
    • http://noviviludizafim.iblogger.org/ccnav6_chapter_1_exam_answers.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/molameboxejesalukon.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/9310b973-730c-4157-8a91-16a34d2f3f19/pimanag.pdfIn PDF document text
    • http://vowaxuf.rf.gd/7408650968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bad312e-55d8-456d-95ed-7ebf0f6b351d/whats_in_a_chick_fil_a_breakfast_burrito.pdfIn PDF document text
    • http://tujugub.rf.gd/10635838767.pdfIn PDF document text
    • http://kudetewususitup.rf.gd/cara_membuat_cv_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e113b9cf-6193-4333-9de2-bbf19b4a3e6c/interview_questions_for_ideal_team_player.pdfIn PDF document text
    • http://bopiguxa.atwebpages.com/bedazzler_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7c0335-26fd-4034-9960-f965654939f9/53704463097.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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 5388 bytes
SHA-256: edfcbf9b5d8877d66362bdd3bba2ac2efeb95e1ac7f4f102fd96608d9d3b57fa
font_01_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 10484 bytes
SHA-256: e9dc224e9fe3b92d3cf0c9582359f17dae765d38e8c50d7fdfde1a755b9835db