Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dcfb79bd171b39…

MALICIOUS

PDF

82.7 KB Created: 2021-07-22 16:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf7b47e7111436475861126cce579b8b SHA-1: 90f3fc22dda659519b23f28cd0869be18ef2aaf4 SHA-256: 91dcfb79bd171b39b49b130aea33e13bbcb747fe9d0c90e05c834a68d6b2ec21
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains embedded URLs that likely lead to further malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into navigating to harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/UZrB20b2Dcg/square?utm_term=hexagon+and+trapezoid
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edbbd2cfabb53e43cd941f/1626192850371/rugasupurimazevid.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0a1f408c731162ada8923/1626382836677/nadowigumakip.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f78c2c896e5a6c1e31183b/1626836012219/jopanupufurugoko.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f18f45103ae60fae56dde5/1626443589211/fukigamilafakavarowigabek.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f63c0277a6136bf6f762c5/1626749954607/xitozugojuvuvuxusabulad.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca27458d864752e040319/1626120820483/fuzafidev.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f55106b386920ff6e3752b/1626689798397/kaxad.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f29e3a29712869f05ec2e6/1626512954261/what_moral_did_you_learn_from_the_story.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f9589854fb7d30544375d1/1626953880844/upper_stomach_and_back_pain_together_after_eating.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f08ec761eeee46ea2a154e/1626377927486/66435493734.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f599b17f1a3935de3418b9/1626708401603/who_are_the_tapes_about_in_13_reasons_why.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0e5421d65320800986054/1626400067272/praxis_math_content_knowledge_practice_test.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec79393a853d606aeb5e48/1626110266036/33444439499.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f75bf415edb1456ddff2f2/1626823668864/natural_hairstyles_for_men.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7e34dd56f0f361271643e/1625809741851/differential_equations_in_physics.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f02c7eec49181e3c134f9d/1626352766914/dazupitorovopisalegomo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f18731425b7b741789c7d1/1626441521544/vanefobib.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f200571d82da67a39aeebf/1626472535257/cremation_in_america.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f74dd5ce4c8104c3ae0294/1626820053612/how_to_convert_to_word_in_pc_for_free.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1ece08ccd1957f4090b1f/1626467552618/sepukujesoxedurefa.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edf2abea8d40126a1e310c/1626206891835/tuwovodavokilaguxomodax.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e95695b132fa36207519be/1625904789506/50583727435.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e79332a3609a707ba81047/1625789234759/11224803655.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_off0000e226.bin
ac30434f43e40a6c0b4bc2908ac11a72e8fb9e20b6f57caf208ae6693ab10c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16944 bytes
font_01_sfnt_off00010e2a.bin
b71ed9471031c91c1aa7e9b757b6aee54fb2acd247358eebd806477a83959894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 10504 bytes
font_02_sfnt_off000125f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 16792 bytes

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