Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19f7cf4d8066eed…

MALICIOUS

PDF

76.5 KB Created: 2021-07-15 15:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e6c6585c52250ca2a21964ff38a693e SHA-1: 423d1c59d0ebde21bcf9eb2e749175efc40bca97 SHA-256: a19f7cf4d8066eed9f9580681ff97bc79bf42dcd19a4785ba80725e6dc85c4f8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The presence of embedded URLs, though many are marked benign, suggests a potential phishing or credential harvesting attempt. The file's structure also shows duplicate object bodies, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/CHqDoFjlE84/square?utm_term=math+answers+with+steps
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee609c7d49fb55d629b3a3/1626235036988/100_centimeters_to_inches.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e960fdc22c005c933a8321/1625907453918/wavelength_match_meaning.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec81dc6ad76c09749013ba/1626112476183/masking_in_pure_tone_audiometry.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee87a89b1e4d6a36113df8/1626245032811/zusazejuxiwufowuzixu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edc15677fc8e778b54505d/1626194262637/48834306523.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7e354c0b954f9ea3a95a/1626111541653/new_fun_unblocked_games.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8b52e94d7a30e05603d5/1626114898821/computer_mcqs_with_answers_free_download.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8da252760ff79c9e97f99/1625872933175/gakuxorez.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8c1616955380ad9e6c42f/1625866593110/scripture_on_waiting_on_the_lord.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8efc658c6623f037fb3c7/1625878470859/95113464308.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_off0000cb0e.bin
ec0d7123ad101ee6d6f70bd011023a48e1137895ebc01e7fdf85f9c43887b97a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 10260 bytes
font_01_sfnt_off0000e224.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 16792 bytes
font_02_sfnt_off0000fa36.bin
9538285aebb8e4c6ca685acb8afccb75cf8d589997dbfc32de6fd8c8c6a28e92
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 16916 bytes