Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e2d9629fa66682…

MALICIOUS

PDF

96.4 KB Created: 2021-07-15 12:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 55239198977b2a165bf64223737fc107 SHA-1: 7198451ca059a1be28d6613f328b558eb09ac073 SHA-256: f3e2d9629fa666822aec9dce815d08817884827c12d52ee6c8106ae20bbb015e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of an image lure linked to an SEO redirector, suggesting a phishing attempt. While no scripts were directly extracted, the PDF structure and associated URLs point towards a phishing attack designed to lure users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/sq/ugae/~3/5Aj-mlxkUx8/square?utm_term=optical+solution+crossword+clue PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edfcf3a4137771ba056102/1626209523506/bibiwoboxekadizirufikin.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee003337ddb5439bfa98ba/1626210355669/ncert_science_class_10_chapter_6_solutions.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec82c77e5cd11affcd1e0a/1626112711947/23954081975.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee77582af4c01978001366/1626240857025/old_hickory_andrew_jackson.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7aa27a1add4dee1eb729/1626110626676/35617125897.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 10716 bytes
SHA-256: 7b88fd0bd7c353f8dd22b9d262000a08f1c03495ddbacd23f0bbca85e073c8ca
font_02_sfnt_off0001443b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443B 19016 bytes
SHA-256: 089fc4aca2c6ea85c608f52783aa4de93d95fb52e35b53917f1c05244600e045

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