Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c6a629ae897c94…

MALICIOUS

PDF

72.5 KB Created: 2021-07-14 06:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3a85abdd6990cfd7d3e9ad1aa9c5e3f6 SHA-1: 87892904a02b010d989aea9c3816dbde2a9ea7d7 SHA-256: 41c6a629ae897c9449a2ddf5e34e5154b03262fb18a33ba83557e2a7ce12a623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a callback phishing scam. The heuristic 'SE_CALLBACK_LURE' indicates the document prompts the user to call a phone number related to billing, refund, or security issues. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing attempt designed to trick users into revealing sensitive information or granting remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6583

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/iYdez4bKglI/square?utm_term=ss+pan+services PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e0d22210ba6bce0ea743/1625874642927/juparizulunejurela.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee155e7426fb5109f1c747/1626215775041/59397167802.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edada95860d606f483f371/1626189225828/exposition_text_generic_structure.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_off0000bca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 10244 bytes
SHA-256: 8f04ad4175e1802a668cf8859a17499dd94e7fe6c71c92b44efe97c7d0a815a8
font_01_sfnt_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 16364 bytes
SHA-256: a7b620eb39e201701a695005712c9cd08361467c3d097aa577c54cd488d61ea3
font_02_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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