Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6b7bfe48e8eac9…

MALICIOUS

PDF

68.1 KB Created: 2021-02-10 22:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a6af56034c7a4887c935614b1980b8fd SHA-1: 678f809644e2088fff4f2660b030ab70c7203218 SHA-256: 4d6b7bfe48e8eac936540539f9f8241c946c7ee2f01e2f9bd856d4ed5a413ea0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, potentially for phishing or to download further payloads.

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://bologen.ru/wb?keyword=avery%205161%20template%20for%20mac%20pages PDF link annotation
    • https://midumelu.weebly.com/uploads/1/3/4/3/134341446/974544.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/faronuxar.pdfIn PDF document text
    • https://xesolisozewil.weebly.com/uploads/1/3/1/3/131379689/6037201.pdfIn PDF document text
    • http://revinulamuxawa.22web.org/44456196843.pdfIn PDF document text
    • https://wefigoga.weebly.com/uploads/1/3/4/0/134041661/lataxawufopi-lufobexuxawolit.pdfIn PDF document text
    • http://fisusuwisefib.22web.org/hero_hunter_games.pdfIn PDF document text
    • https://fojakodi.weebly.com/uploads/1/3/1/3/131379163/c7af15.pdfIn PDF document text
    • http://fabikaj.iblogger.org/58453215403.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/ghbhiib/damalawafikitapulilutoma.pdfIn PDF document text
    • http://ziponep.22web.org/tukedemixisadatut.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/hdeFPjf/hide._io_jogo_pc.pdfIn PDF document text
    • https://retezuve.weebly.com/uploads/1/3/2/7/132741149/becb360418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunowik.epizy.com/71339359012.pdfIn PDF document text
    • http://pibumox.rf.gd/physics_and_maths_tutor_dna_technology_answers.pdfIn PDF document text
    • http://musovulazapa.epizy.com/77977126821.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_off0000cab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB0 5816 bytes
SHA-256: 27c4c705e3724e875a9ee67faf6965af3b67ef985e9d477bcd50b0c109721700
font_01_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 10744 bytes
SHA-256: 138c5ca31b9c4fcad12d9e7a1a8582c4ddff32969973ce8c2019f40bdd6d0676

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