Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e417ebc9f01519…

MALICIOUS

PDF

95.2 KB Created: 2021-06-08 14:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 32910cb2e41a0e3f0008ebe95e7b3ddf SHA-1: ebcaf7510d2de67e6d03c173e6f891eacca244c7 SHA-256: a6e417ebc9f01519f341c462400c1dc9216fdc361ad2b484280de9e97f595f1c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, likely serves to redirect users to these malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://laborke.ru/pbw?utm_term=the+midwife%2527s+apprentice+chapter+summary PDF link annotation
    • https://zoxavemawoba.weebly.com/uploads/1/3/4/7/134728713/vapisaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_606d8d8729d23.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/2158855.pdfIn PDF document text
    • https://woxupixukuxosi.weebly.com/uploads/1/3/5/3/135316012/demopoki.pdfIn PDF document text
    • https://mexakogu.weebly.com/uploads/1/3/5/9/135981712/4325320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_605651864b618.pdfIn PDF document text
    • https://bibunifa.weebly.com/uploads/1/3/4/0/134040356/41355fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_6027eff5900a3.pdfIn PDF document text
    • https://jovufunodal.weebly.com/uploads/1/3/7/5/137503800/fewebu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387925/normal_60b6eae87c975.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/5433033.pdfIn PDF document text
    • https://vififeroxesazu.weebly.com/uploads/1/3/4/7/134737415/8105a233619.pdfIn PDF document text
    • https://zowuxani.weebly.com/uploads/1/3/4/8/134898183/panarusobumiji.pdfIn PDF document text
    • https://pumelagu.weebly.com/uploads/1/3/2/8/132814433/sipataxajofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_5fd76fd937b55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_602cb710db999.pdfIn PDF document text
    • https://lefofikik.weebly.com/uploads/1/3/5/3/135316562/kowanafizonu-kobulo-doxojizu-xotafigetamijo.pdfIn PDF document text
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/dober_xapupovogefiwe.pdfIn PDF document text
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/7913170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_60bb3aff5d4b6.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/3110365.pdfIn PDF document text
    • https://puxomesepose.weebly.com/uploads/1/3/5/9/135977076/2153109.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
    • 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_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 5312 bytes
SHA-256: 84f84d816b6c2ed464130fed4f6817475604eea1e4ad4f1be4dc28762453a69f
font_01_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 11568 bytes
SHA-256: 5b56ef2f66fd355a5c46847c55654d22bb4a4b3f199dec1fb26d7ec22fd31418
font_02_sfnt_off0001614d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378