Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf3ab30685624b5…

MALICIOUS

PDF

72.6 KB Created: 2021-07-14 07:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a30345968fa9180ea8f616b0bfa67396 SHA-1: 40dae388eb6c07a3047f46b46dd0e54da28e7d93 SHA-256: dcf3ab30685624b5a8ad6607d93985ed28bdfaebe80192e5716d86dca128f29b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a phishing lure, using an image link to an SEO redirector for a free download. While no scripts were extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload. The embedded URLs, though mostly benign, are part of the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8216

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
  • 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.
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/-MXWpcYQ7kA/square?utm_term=interactive+pdfs+indesign PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7cf44f29cd6423db3ee52/1625804612330/tigojeve.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e81bf37be683581ce507f0/1625824244050/a_common_cause_of_peptic_ulcer_disease_is.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ede3d7a50f6e33a324bbf0/1626203095545/deficient_in_a_sentence.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8faf95ebba154a8fa80eb/1625881337312/98584120903.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edfa21a9aa746350ceef2d/1626208801340/how_to_say_will_in_asl.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7F 16232 bytes
SHA-256: 5609b44b19d9e3237c19c57f398a021aee65714513ad48d7940798190389e135
font_01_sfnt_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 10648 bytes
SHA-256: 1d667a39459de076d70b6ec5a86486db72e6bbb5d9028add91e1886b675866cd

Open this report in the interactive analyzer, or submit your own file for analysis.