Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab49c5cdcc45be5…

MALICIOUS

PDF

75.9 KB Created: 2021-07-15 10:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0b4c69c97a0b95d75fde88498c1c340c SHA-1: 1b3c4663710021a45c21da930246dcf7a6bcdcec SHA-256: 8ab49c5cdcc45be519c2c0253f3879926331c9daa298e819f6f76ee6fbf39b49
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI that redirects to a URL associated with a 'free-download phishing' lure. Although no scripts were extracted, the PDF structure and heuristic firings indicate an attempt to trick the user into navigating to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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
  • 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/J-SxIuB37Ms/square?utm_term=it+is+very+embarrassing PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee1855588fb56695118e16/1626216533397/meaning_of_cold_sweats.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efd8d7ec49181e3c0fd90a/1626331351897/comprehension_with_questions_and_answers_for_grade_4.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edab5b4325c5343bbb09f4/1626188635283/vezumosideli.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee11c9eed6cd77ab5eca51/1626214857699/machinery_condition_monitoring_principles_and_practices.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f90c85664d35b0e8b9c8/1625815308798/combined_gas_law_constant.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_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 15852 bytes
SHA-256: d3d619c2867d704b15e78e4694e590ee4ac077035261febfc1262caa31564243
font_01_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10556 bytes
SHA-256: 0b2e3aec4cce02e7cd1516a58353c7face7f7092d701c87515fe3fd47d8f8c90

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