Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c4d3ad95ce4fb1…

MALICIOUS

PDF

58.6 KB Created: 2020-12-22 12:34:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c36ce490b4c1df2f8b4f315fd97998 SHA-1: 166907e2c902e3d95c172002f784f3c52da9cfcb SHA-256: a3c4d3ad95ce4fb1b258e49fc26afbe3c185a9624992bf45aded0daa98fb87a7
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://trafffe.ru/strik?utm_term=football+championship+trophy+shop
    • https://cdn-cms.f-static.net/uploads/4422914/normal_5fbae6dbef6f6.pdf
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fcc0b093d571.pdf
    • https://cdn-cms.f-static.net/uploads/4393036/normal_5faf84ceb9418.pdf
    • https://cdn-cms.f-static.net/uploads/4458622/normal_5fb7c30285bc4.pdf
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/6e15a661.pdf
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fbf3fe949127.pdf
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5f9380aedad5d.pdf
    • https://litisowof.weebly.com/uploads/1/3/4/6/134692954/8358990.pdf
    • https://vosomomoratefuf.weebly.com/uploads/1/3/4/6/134614816/fowerodorix_suwowedu_fozututuza.pdf
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/lidexaliro_kesawib_bexotusovodi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fe02e3cf67c863bcd195170/t/5fe10e7c73917a63474e8e6a/1608584828168/zotenonobunilevefa.pdf
    • https://s3.amazonaws.com/legobegutulo/eater_of_worlds_guide_terraria.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_off0000a9af.bin
cb9dbd3bd97e061951b17f9b8f5bc0d712ff50e6ab07986e122446b3ba73556a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AF 5372 bytes
font_01_sfnt_off0000bbca.bin
19c4c1a08fbe0218fa2f67c95d79a0bf9472763562d5bf246a1b024af80a6c97
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCA 9480 bytes