Malicious PDF — malware analysis report

Static analysis result for SHA-256 da267099243d5c35…

MALICIOUS

PDF

77.1 KB Created: 2021-07-14 08:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f210ade8aadcad21775c82cad7c9997 SHA-1: 15e7017087e018953cea9a2d855de08c53017ab4 SHA-256: da267099243d5c35c4f4330d3185b7d9132e1db8d530dcdd605bdf51d499a019
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it contains a callback phishing lure, prompting the user to call a phone number in a context related to billing, refunds, or security. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristic firings suggest an attempt to trick the user into engaging with a malicious actor. The document's content is heavily obfuscated and appears to be generated by wkhtmltopdf.

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
  • 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) 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/AnJPYMJXbyQ/square?utm_term=workforce+past+questions+and+answers
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec770f0cf33f708d79227e/1626109711789/the_earth_is_not_overpopulated.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca785e0914637f38e5d6f/1626122117782/zozarukibefunezetomur.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee4524462f394a1e42dbfd/1626228004369/chomp_kitchen_and_drinks.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee38461cf0e6777f2e105e/1626224710926/mujugawefogesenelen.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec911a1951226b8b8bd67a/1626116379070/xivanevozufuzodomofox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb52.bin
562a999c208c95a4f1bed28748368a1aa9d9f684088fd646cf86d1cc7be3711f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 10984 bytes
font_01_sfnt_off0000e4ce.bin
0b8fa7b0217a6c7343845b905e826543b999118690149a1d76185239c98dc5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 16868 bytes
font_02_sfnt_off00011075.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 16792 bytes

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