Malicious PDF — malware analysis report

Static analysis result for SHA-256 546540fad716f44a…

MALICIOUS

PDF

80.3 KB Created: 2021-03-03 18:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 97b1a2aabc06c85f837311063f23747d SHA-1: 74a2687dc3c690ed126ab9c261b4f9e981f52949 SHA-256: 546540fad716f44a74e6686beedf4e5ddf686a5bf84968c11adf4e51633c2572
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host many links on potentially untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=kitchenaid+professional+600+bowl+size PDF link annotation
    • https://cdn.sqhk.co/midipijikami/jevjbmn/automatic_wallpaper_changer_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380536/normal_6018381be96c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fd664d40e253.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/gfjhg5z/bakal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421970/normal_5fddc5a99cc44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_60229f0dbd950.pdfIn PDF document text
    • https://sazopugewado.weebly.com/uploads/1/3/1/4/131453094/7793144.pdfIn PDF document text
    • http://mail-autoscout24.net/nuwamujerakixemukisosovpri2.pdfIn PDF document text
    • https://jabukosiw.weebly.com/uploads/1/3/0/8/130874379/podeto_baretetupanuli_gejefusum.pdfIn PDF document text
    • http://vidclips.design/zudibejebomitolawufukidlsccc.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/nogujojowibup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fcb6ce098cc7.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/ibBUJia/86220930225.pdfIn PDF document text
    • https://wewivipumi.weebly.com/uploads/1/3/0/7/130775870/vexoguxirusijijoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fccdf42a6330.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/ge5jhGI/93456609931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 5792 bytes
SHA-256: 7db6c4535d04172c72d541c2f1819aefa2db685547f9cef73ed98701f4f8eff8
font_01_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 11060 bytes
SHA-256: b2eb8558ec9dea4b701121a8294f9bb6188b0e3dadbd4a17441a6c2eb82c3f0b

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