Malicious PDF — malware analysis report

Static analysis result for SHA-256 3701ce0768ff302f…

MALICIOUS

PDF

80.6 KB Created: 2021-07-13 20:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 428fa530ba5bae620884eea809fa7d39 SHA-1: 42aebc3ffcefed12b07afa7e8aee0ea1e6eb6379 SHA-256: 3701ce0768ff302f3a7cdf3508e6ac1e2d742456d986662387c49cce177f5ca1
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ML classifier and ClamAV, with heuristics indicating it is a callback phishing lure. Although no document body text was readable, the presence of embedded URLs and the nature of the heuristics suggest an attempt to trick the user into contacting a malicious actor. No scripts were extracted, limiting further analysis of the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/razvivatel/yapz/~3/7R6buoffwiA/square?utm_term=repaying+overpayment+of+benefits
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8fa30dc37083541b70d58/1625881136703/the_squeeze_michael_keaton.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e9418cf107ff2467ea0c0e/1625899405076/worksheet_atoms_isotopes_and_ions.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed43a2bc9b4721000b184d/1626162082914/forces_and_motion_virtual_lab_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed4b5df95b5524f951d289/1626164061150/fastest_racehorse_of_all_time.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edbcd1095dee413450b0aa/1626193105210/the_holderness_family_christmas.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8c2c45711547b6a6c6ae/1626115116915/how_to_use_double_space_in_word.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e819b87e45264421fb21d5/1625823672997/fakifokorebefozixonulife.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e926e35fa2eb14b90bf229/1625892579141/storm_is_over_by_r_kelly_audio_download.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7eee24454ab0ddd86a913/1625812706274/57441684408.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f18025441e1b3786e2ec/1625813376538/42892181227.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edab46834e745de9d1d9bb/1626188615054/read_liberty_100_electric_meter.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_off0000d8ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 16792 bytes
font_01_sfnt_off0000f111.bin
f7cdc7fdb521552338762ccc520800b4ab8e90aaf6358cfa7cbb38771fef417b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16668 bytes
font_02_sfnt_off00011c6c.bin
23f36b6a3d6ac494c358f3b2ee4d7839ec4ad4f36d6f66b1caa8f05ce2fc0408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 11020 bytes

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