Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf27e34d90bd2ad…

MALICIOUS

PDF

69.2 KB Created: 2020-12-31 02:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3303220a89ae792dc0e9d010dc85898c SHA-1: ed54bc182373227ed64f3fd4099d7d30baa66b7d SHA-256: 4cf27e34d90bd2ad20a18abeb449f2f346b0e620b44036eaffc9a6ce58c81c8c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/strik?utm_term=graphing+coordinates+pictures+free+worksheets
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/jovepisonuluvafunit.pdf
    • https://nuzefamulazoxiz.weebly.com/uploads/1/3/4/5/134582777/tetaz_getobafefaves_mifikodisag.pdf
    • https://cdn.sqhk.co/munakuvu/cjibgjd/teacher_assistant_grade_book_high_school.pdf
    • https://cdn.sqhk.co/nozujeraguje/dibYmXm/fowit.pdf
    • https://lexigeme.weebly.com/uploads/1/3/4/5/134524735/tuzopa-dawibonel-bewimoz-xogapowavozo.pdf
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/769829.pdf
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f874c75a73e1.pdf
    • https://boxijapemisavar.weebly.com/uploads/1/3/0/8/130874030/2025361.pdf
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fabde92b0fef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97bd79c2-cca4-44ac-9e1b-f74e28c8bcf7/tabewezagiwobikidowub.pdf
    • https://uploads.strikinglycdn.com/files/08d271eb-c8bd-45e8-b291-54cdb6413e2d/1391975439.pdf
    • https://uploads.strikinglycdn.com/files/5cfb8777-94f3-490f-a083-1a4738707962/ge_spacemaker_xl1800_manual.pdf
    • https://uploads.strikinglycdn.com/files/adf8e3a2-bf05-44ee-bb78-5c2d819e253c/63032841234.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d273.bin
19adcdd1d226b9ac552f377435076ace5bdd5cb07d7bf907796361b179732a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 5572 bytes
font_01_sfnt_off0000e577.bin
e31e2cb79c0dbb678263eb03b558a3c72297be431b77cb2a7a5674c6a126d34f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 10124 bytes