Malicious PDF — malware analysis report

Static analysis result for SHA-256 a405c6139f7e8e26…

MALICIOUS

PDF

79.9 KB Created: 2021-07-13 16:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff124f554a0315b0ed10cb709cb2d655 SHA-1: bf62273597f0bd44090abb1e36190474c00e956e SHA-256: a405c6139f7e8e265e12fe8b67fb5a58a9163d32675fe0ad8bd11e15dece02d2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to potentially harmful content. The PDF structure itself contains duplicate objects, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/jEScUJLm1bs/square?utm_term=loose+interpretation+of+the+constitution+definition
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed8a68cdb2ce13c527ffa0/1626180200505/87930695294.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8c7c243eac6055cf6409/1626115196951/what_is_the_3_digit_voice_response_number.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8b9c8300fd66e197278c/1626114972546/very_well_liked.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8ada3f7a034ccb7b55e0/1626114778408/multiplying_fractions_story_problems.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7dc258f757b1ac451af53/1625807909918/89942420911.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e915ab2dabf2723553d8d0/1625888171492/fexagofaluxerapun.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec90e044349d7bb06d6373/1626116321117/76423044892.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91af73f195e1e4036248f/1625889527321/the_expendables_1999.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e76dd159d923514b225435/1625779666020/iliopsoas_release_physical_therapy.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c24ae534972f7b79b9d7/1625866827029/kikerusivegu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8e34bc4c1a734c5d34755/1625875275198/7807469229.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e90c40309bd63f3d854f1b/1625885760798/magbook_indian_history.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7dd7ef188817f7e0d9a6/1626111447634/formality_in_tagalog.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_off0000d866.bin
5320f2372d9b584c294605a2a3afdf70c3e6f8c92376ac68549aa9db63a8d46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 10728 bytes
font_01_sfnt_off0000f0fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
font_02_sfnt_off00010910.bin
66f2fa9a0956d1583f11f6f52db5474726865ddd1b7c4c876274c85025ae9235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 16184 bytes

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