Malicious PDF — malware analysis report

Static analysis result for SHA-256 8531d1b2738f53e3…

MALICIOUS

PDF

78.1 KB Created: 2021-07-14 03:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5469fd6b0b43a7355eee05c60b02ad0b SHA-1: 9890d9d15b865488759c13da47c47f589d46bc3c SHA-256: 8531d1b2738f53e358a19e8a5fe99a4d948582f735f9f34b950b8ea33f6adff2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded external URI pointing to a suspicious domain, which is a common tactic for phishing lures. No scripts were extracted, but the presence of the malicious URL suggests an attempt to redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/square?utm_term=red+king+fish
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e81bf37be683581ce507f0/1625824244050/a_common_cause_of_peptic_ulcer_disease_is.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e81d58c6623f037f2199/1625876509570/divijewitepuninuzepo.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9065a5fa2eb14b90a9855/1625884250808/two_body_paragraphs.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7e3a72e2584f2462b48a/1626111546808/bewageravilomuvov.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec94e39cb57f380a790c69/1626117347693/movie_quizzes_and_answers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7663de8c3264fe5d89a5/1626109539808/dicyclomine_and_gastroparesis.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edf66836d517042362dcc6/1626207848259/17340687030.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7ca9480504e0a776895b3/1625803412305/dadofu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e89e726b56ce28892b7f48/1625857650664/simple_example_of_array_in_c.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e2ed566ded7d61a9a128/1625875181430/drywall_partition_details.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_off0000d4da.bin
9e094582dec877586ff87d0d5b34e4f04df1a7c4bc2e0dc1fe01646d0dd2062f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16116 bytes
font_01_sfnt_off0000fdde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 16792 bytes
font_02_sfnt_off000115f5.bin
7fe08c821838d236a6d2a222c0d95680a2b124ad48956fdc965a789372596b7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 10244 bytes