Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bffcbdb14475c7…

MALICIOUS

PDF

80.0 KB Created: 2021-02-28 23:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2c7ab6c9f2a49b0f6f98bbcf1a35b826 SHA-1: b569fbe1700174d0fae252d72300f7a6969f911b SHA-256: 31bffcbdb14475c796e71c97f6202115e7f66435949c42c0eac218b9248fa496
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a lure for a free download, directing users to an external URL. Heuristics indicate this is an SEO redirector for phishing, and ML classifiers strongly flag it as malicious. The document also contains a heuristic indicating it instructs the user to copy/paste content into a shell, suggesting an attempt to execute commands.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://golowaki.ru/123?utm_term=bash+scripting+guide+ubuntu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5ff90ae08f578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474231/normal_6005ba806bd08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_60228a5c6679e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fcaff782802f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482405/normal_6000fc0dd1c22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5ff0ccdb36931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_6021572b96244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fc699650fa18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_60243688d585c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423195/normal_5fcf84a2533e2.pdfIn PDF document text
    • http://tikenifoziv.22web.org/birthday_invitation_templates_for_boy.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/zoromexemuzid/winibewofowijawemet.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/26179368009.pdfIn PDF document text
    • http://suludigana.epizy.com/fajapivexepozazagoke.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/wojofi.pdfIn PDF document text
    • http://kexofiz.epizy.com/critical_role_s2_character_sheets.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 5492 bytes
SHA-256: d0d28c99f227d838c46ce89efef20669d670341eccecc3697e025f19630586e1
font_01_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 11488 bytes
SHA-256: 5c2bfd2ef98678376dc9791cb23ef084d35ac8841154c935ac907f0028e9ea6b

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