Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce50fde534bf16ae…

MALICIOUS

PDF

67.5 KB Created: 2021-02-16 03:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 53972429ef32ea02452dd5b933fdaf7a SHA-1: 6905800a02306f11206668a5450fac5e13b9465a SHA-256: ce50fde534bf16aec377df9a35abf3f370a8c8fb77b5db22bd627677c14920d5
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, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to phishing or malware-distributing sites.

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://druttle.ru/strik?utm_term=weber+spirit+2+3+burner+grill+cover PDF link annotation
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/5075662.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/gC0WZxr/feist_1234_album.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385206/normal_5feef8dbc6989.pdfIn PDF document text
    • https://vusozegaxu.weebly.com/uploads/1/3/0/8/130874635/nasigoruruditipirijo.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/dihhfid/24064225347.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/ghaFjfZ/xipolonojafijifidepevox.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/9230451.pdfIn PDF document text
    • https://nuvaxavixo.weebly.com/uploads/1/3/0/7/130738964/87d08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5fcb932652f48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486981/normal_600839f66bfa7.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/tivudus-lepovajuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_60290e3bb43ee.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/sadesuruvizisoj.pdfIn PDF document text
    • https://jepexilopenokaf.weebly.com/uploads/1/3/2/6/132680937/4040619.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/jubiferekaka/9596109771.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/97071937180.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/appium_android_scroll_down.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_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 5400 bytes
SHA-256: de79c2fbe248850cae15a19feeabad28538f0ebc02c0b665789a2fed06fb4116
font_01_sfnt_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 10340 bytes
SHA-256: 3f03ffd4d7312e39526b5752611bf4f332b7ddcc362fe3653ae37ac747eadfc1

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