Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4470ac81083e283…

MALICIOUS

PDF

69.4 KB Created: 2020-12-23 07:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6938ff0dfc3c88e8c2463dad62cf1d30 SHA-1: 594649ec47fc44dbc754b35ebb0faa8eaedb9b6e SHA-256: c4470ac81083e283a5fe7a79c3a5700c76d06880b252eab0e22810544972cad5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'traffine.ru', which is suspicious. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan-like behavior. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to potentially malicious content or phishing sites.

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=meepo+city+rider+2+for+sale
    • https://cdn-cms.f-static.net/uploads/4407991/normal_5fb00359a6266.pdf
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5fd688d45408a.pdf
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/925029.pdf
    • https://static.s123-cdn-static.com/uploads/4412762/normal_5fc8e01dce25b.pdf
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5fa35f09c77cb.pdf
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/d0a23005.pdf
    • https://static.s123-cdn-static.com/uploads/4367912/normal_5fcebecd003ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2f89e6fb-f5d8-4711-9f3f-2f2200f7ef6c/zokabidodufivodira.pdf
    • https://uploads.strikinglycdn.com/files/5b7ba785-ed1f-49b7-8f4f-60c52a977aa7/kutatoxevuxogubon.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5ade9d79364840856e8b/1606376159218/76756297800.pdf
    • https://uploads.strikinglycdn.com/files/a75a0f07-0a63-457b-9650-d9c983141831/2023471922.pdf
    • https://uploads.strikinglycdn.com/files/1563dd87-3d2a-49ae-82db-fdc776f53e0f/77602510228.pdf
    • https://uploads.strikinglycdn.com/files/8afa4621-2a58-4ad6-9f04-61d97f8cba17/psu_mgis_program.pdf
    • https://uploads.strikinglycdn.com/files/f96af02a-0596-41e4-a206-4f26b7ff2e8e/koweratuvasi.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_off0000d2da.bin
a940e5d4528f222d3dca9d2f64c8817c0514273317333d764ea27a626b5a2b82
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 5388 bytes
font_01_sfnt_off0000e559.bin
e6e8ddbbcf826a91c2672efac6e56d43018189d47b7011e794e38f90c029cacb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 10644 bytes