Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db8c416311af31c…

MALICIOUS

PDF

73.1 KB Created: 2020-12-18 10:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8cb914a0e142c83d10d180b7f7f20c0e SHA-1: eb44a55674a2a0d9c3fbcb1292585287d13ee6e9 SHA-256: 9db8c416311af31cb2930b724599d682b6f6acdd41a9d3950b183a266330d461
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing an embedded URL that directs to a suspicious domain, identified as malicious by ClamAV and a machine learning classifier. The document body, though heavily obfuscated, contains text related to 'Mccollum high school alumni', suggesting a social engineering lure. The presence of an external URI and the overall detection by multiple security tools indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=mccollum+high+school+alumni PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f887bbfde78e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_5fb6c4b97dfc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_5fa3c3bc31310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376096/normal_5fc3e4e5177e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5f944d15e02e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megulu/autobiography_of_indian_cricketers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36d1d405d5340f339be82/t/5fd033bb8f1ddd5ccbd53edb/1607480252630/76326733056.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/pazavinukoxivemarato.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54d583398ff75154af26b/t/5fc80c23ee7ca3754e3492b7/1606945829298/lofozaridejulevofumilasi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf517da97599144eee07cc/1606373762434/bitowivezerakawajipoxugok.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dc7ae9fc3622d53b5433/t/5fcc61033ff1011540e826ca/1607229703616/fatozitidozowop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54ad5cd1e280355f12c83/t/5fd1464919a14752e6aa924d/1607550538568/ripifu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f0cad49dd12447345200/t/5fc82581e101942bf7655ce9/1606952322358/pug_licking_screen_wallpaper.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 5120 bytes
SHA-256: 150ec40bdf660f033cf82cfdb5030a3e93ff42cdf4388683308bb3de512e2d3d
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 11376 bytes
SHA-256: ba84e4359b46e53fd21febb5c87156a9dc1f3bda9bbbcdfe8f8f91ad858471c1

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