Malicious PDF — malware analysis report

Static analysis result for SHA-256 7332871576d1e856…

MALICIOUS

PDF

71.6 KB Created: 2021-02-17 15:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 27f5fa86a76ee390994e143a03f49b95 SHA-1: ecf9d6e55c5309e24134dc53fa90494d3346faf0 SHA-256: 7332871576d1e856a36c58aba28641ce8997ba7b2077a8e3bff9b185cabadac0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least one, 'https://seumenha.ru/strik?utm_term=mini+displayport+to+vga+hdmi+dvi', appearing to be a redirector or part of a phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=mini+displayport+to+vga+hdmi+dvi PDF link annotation
    • https://cdn.sqhk.co/xafiguzi/Gje4Eij/incivility_definition_and_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_6007bbf4f2db6.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/cPrgihj/4162537076.pdfIn PDF document text
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/rilabiz.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/52154a652feb4dc.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/giaqjcX/play_tennis_in_spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419851/normal_5fcc9115f0d47.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/jeViaFw/54682138639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_6014ff4fb4b78.pdfIn PDF document text
    • https://wakutoji.weebly.com/uploads/1/3/4/3/134314583/jebilaf_gewelamef.pdfIn PDF document text
    • https://gavevuroboba.weebly.com/uploads/1/3/5/9/135959422/zonumakasebal.pdfIn PDF document text
    • http://sobofikikovir.22web.org/mnemonics_techniques_to_improve_memory.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366327/normal_6007276a169b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/indeed_accounting_skills_assessment_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/new_movies_songs_2019_telugu.pdfIn PDF document text
    • http://wodasakuzetu.rf.gd/paid_app_free_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/shumaila_kosar_naat_hasbi_rabbi_video.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/bs_player_pro_free_latest_version.pdfIn PDF document text
    • http://rejinivak.rf.gd/bitvise_ssh_client_6._47.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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 5540 bytes
SHA-256: 352a04d9864d5454325f5f4c893efaca05935dc44afdd0236867561f8402ded9
font_01_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 10804 bytes
SHA-256: 8bfde6116f9d8029c87df45177a916af47b44caeb4fdb81b07ab1f1e6a577e23

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