Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3a8c6687d92a0c…

MALICIOUS

PDF

68.3 KB Created: 2020-12-19 00:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 191ff3c9463ac473a28d2e367ad2675f SHA-1: 130dba06560972782944c3ab53e4c3cf7270e163 SHA-256: 6a3a8c6687d92a0ce9525d4a2c666dc84bb6e46589fbe643b90a35e536cd60f4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support the malicious verdict, indicating this PDF is likely part of a phishing or malware distribution scheme.

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://trafftec.ru/strik?utm_term=42+inches+in+feet+is+how+long
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/9701927.pdf
    • https://votetofovuwov.weebly.com/uploads/1/3/4/9/134901863/7322062.pdf
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5fdab95ca4a2c.pdf
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f9f8669c694f.pdf
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f9a458d2905d.pdf
    • https://cdn-cms.f-static.net/uploads/4421040/normal_5fa6ea0390ea6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4569e186-dfcf-4ad1-ab8d-045735671bf6/game_speed_hack_tool_apk.pdf
    • https://s3.amazonaws.com/wewiro/cessna_340a_ram_performance.pdf
    • https://uploads.strikinglycdn.com/files/ab586c21-bd4b-4d48-b725-291040f7261b/kedatovafewil.pdf
    • https://static1.squarespace.com/static/5fc114532bbd74065807882e/t/5fc174fd1972c46e3cd5fc41/1606513917502/sezofadovamipuwetoruba.pdf
    • https://uploads.strikinglycdn.com/files/4de6b14e-16d2-4eac-bd55-551078f96e2a/daxagagipizeteten.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_off0000cfe8.bin
8446c259b94df53fdead0dd642e07c53202a81d2f7698b78737bd4a04ace397f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 5056 bytes
font_01_sfnt_off0000e13d.bin
7b5e9e219397eb940f250ddf710cb57b710de2722c4e1f7a6e36609844c4f31e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 10560 bytes