Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a9531de64efb8c…

MALICIOUS

PDF

58.3 KB Created: 2020-11-25 05:06:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a07849db1986283b09d96f82be9dad02 SHA-1: bef93bf83245300c2a6df5268e42ab261b5937d2 SHA-256: 85a9531de64efb8cd24faece3aac35982d83001a95cd068cb91a9ede294ece47
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm or SEO abuse tactic. The primary external URI points to 'trafftec.ru', suggesting a traffic redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=playmobil+knights+sets
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/fifalupiku.pdf
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8f7113344f9.pdf
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/6720f.pdf
    • https://lowijagaji.weebly.com/uploads/1/3/4/3/134394878/6ce3031516bf3cd.pdf
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8a31604794a.pdf
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5f9fc240e44bf.pdf
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/1288697.pdf
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fbdbc6edb722.pdf
    • https://somafixuwase.weebly.com/uploads/1/3/4/6/134605374/9992149.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5c79aab3-e977-430e-a4ce-f0e0ec11b629/guernsey_used_cars_facebook.pdf
    • https://uploads.strikinglycdn.com/files/6034e044-0c58-425c-9c1e-3a6036dce3cc/64112095454.pdf
    • https://uploads.strikinglycdn.com/files/2d31c08b-07ea-469b-8250-356b0a3f3f5d/royals_seating_chart_310.pdf
    • https://uploads.strikinglycdn.com/files/da6a457b-0edf-4591-bac9-49d20a1030ce/83678345504.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_off0000aa27.bin
ef82908fd1d2369ad94b3e70b9ad076b77b55be075a7ece446bdb043112633e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA27 5308 bytes
font_01_sfnt_off0000bc21.bin
121395d1eaaa8b7d0ef477f0307b4afd5bcf170055805a0bbf565ce1ee245e34
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC21 9552 bytes