Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5a570b3b3fa13f…

MALICIOUS

PDF

84.0 KB Created: 2021-07-14 08:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a71779de350048efd01764fcefc5b29b SHA-1: dcbc3ce2623b7e4147c6bdd01d5b4c1b30ec03c1 SHA-256: 8d5a570b3b3fa13fb2276693a26271ad1f6bded79c5b8b1246d82a08d4399fce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, 'coretry.ru', which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of the malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://coretry.ru/square?utm_term=difference+of+was+and+were
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8da305183b3b579e0099/1626115491224/delsey_luggage_lock_instructions.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7c3ed687a3d659a4b00bd/1625801709614/the_relevance_of.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7baae4aaab0286a891b41/1625799342857/syphilis_skin_to_skin_contact.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e914b0025aa46e30d245a6/1625887920837/52691046263.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec9a309a1cf201f806bbc7/1626118704827/tuburipiwabolipifupiro.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec90ba478ebe26bfc67f74/1626116282851/wickedwhims_not_working.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e802117be683581ce40403/1625817617165/151_essays_latest_edition_free_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7f5df89f8e700bf6f50b/1626111837301/bojipuvudujeloxodapu.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9446b2210ba6bce133c96/1625900139446/using_filezilla_for_ftp.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6c.bin
97f1e064489fac972622bd6f8d985952eee6d64cae4bc5cd01998774c606c22c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 10412 bytes
font_01_sfnt_off0000e62d.bin
c6b61d0e898bb520b3ebf69f3a636616bd25b8fa672703b74f7b36e46953344c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 17148 bytes
font_02_sfnt_off000112e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 16792 bytes
font_03_sfnt_off00012af7.bin
d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 16488 bytes

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