Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb1dd61c9acf4cf…

MALICIOUS

PDF

72.5 KB Created: 2021-03-04 12:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5d55b0a1ebc34ea2a4f7fe898adb846d SHA-1: 9919781010459d44b3890bf29bb8448b4c17254d SHA-256: 8fb1dd61c9acf4cf01ee708d1067c9c36865be794ba911dec4db9cc63b1248e3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically appearing as 'assembly instructions' for a desk. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=mainstays+side+storage+desk+assembly+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fc84ac36c8c7.pdfIn PDF document text
    • http://zdsshop.top/sinach_because_you_live_songz53ot.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/kunisofaxupufozubi.pdfIn PDF document text
    • http://alexsaf.ru/lefibixumuzumitaleblxsd.pdfIn PDF document text
    • http://ewwe.space/gelifobotukemiloy14io.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/64721975256.pdfIn PDF document text
    • http://raifaisentgo.online/21239039711tfo76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_6018853e2cfd4.pdfIn PDF document text
    • http://webcam-model.online/jubexogiputudepefemw4dl1.pdfIn PDF document text
    • http://jobs-ingenieur.best/67826227286sgvqu.pdfIn PDF document text
    • http://load-bcp.com/566843606758n37m.pdfIn PDF document text
    • http://exemplpusj.com/free_water_parks_in_tampa_floridai6n3o.pdfIn PDF document text
    • http://itdomen.fun/24573844714yyxws.pdfIn PDF document text
    • http://bapupozizevose.22web.org/rubber_sheet_drying_machine.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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 5568 bytes
SHA-256: 0e3cb009e9de385647209c8bb99e1e7b49789359a7680b440da7349b969d2f50
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 11292 bytes
SHA-256: 15c1773a2bb6df7abe35ac00c218bc1efdd65230e2ae662093bdeca172eab790

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