Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3e2a2121d983c…

MALICIOUS

PDF

73.8 KB Created: 2021-02-21 17:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 006fe8741c899f5b9f4d9130bd330780 SHA-1: 4811d899faddc1876aef1d423b4b905843cf00e6 SHA-256: 5af3e2a2121d983c3ad62691a79b35522e5b69d59e04b8c47ba7fbb6ef361b38
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing lure.

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://jacksth.ru/wix?keyword=2020+medicare+fee+schedule+florida PDF link annotation
    • http://blubadgehelp.net/aankhen_film_songrpmbx.pdfIn PDF document text
    • http://premial.su/wewifarusejasejanigilekiotn2y.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/266809833361mizv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_6001bb41837c7.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/jehjIv3/download_ckz_origins_v2._0._1_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418747/normal_5fe4de0107c9a.pdfIn PDF document text
    • http://mini-cam1.club/kerolafokoriwigopurap.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/ggAhb6I/detovovisiridugol.pdfIn PDF document text
    • http://verenica.net/32531409383pput.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/CPhgib3/refepugejavoxilela.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/hjfjfZj/tixafutomibo.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/zakunafu/bopebaxetanovugetiguled.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_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 5440 bytes
SHA-256: f6e1e2f3cd4eeef06aa79bf1f71c84ef2786a8461a9615472c55a9887a71f198
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 10680 bytes
SHA-256: 9187e0155ac57065c11e4ac301e5b112f8092eb01b24846b33bf38ff4d7e305b

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