Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb3e491e27d048e…

MALICIOUS

PDF

71.7 KB Created: 2021-02-13 23:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd8672a4485821f0f0afce5d5332ea24 SHA-1: e1973fd56a4c5720c686e8d2293b4cc835006e0c SHA-256: 3cb3e491e27d048e81035188903440227d2e595097c349c45371973dccde7092
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 ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were extracted, the presence of embedded URIs and the overall structure suggest the document is designed to redirect users to potentially harmful websites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=calculus+pioneer+newton+crossword+clue
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/zorap.pdf
    • https://vinovebavelugis.weebly.com/uploads/1/3/1/3/131383284/c6836f8208.pdf
    • https://static.s123-cdn-static.com/uploads/4501057/normal_5fe1469030722.pdf
    • https://cdn-cms.f-static.net/uploads/4391340/normal_60164928aaca1.pdf
    • https://cdn-cms.f-static.net/uploads/4459329/normal_5fd9e5dbac3bd.pdf
    • https://static.s123-cdn-static.com/uploads/4381532/normal_5fe5edb6a0447.pdf
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/c41288.pdf
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/kimasesuma-dafinovivera-vaberala-faxevavewuxoke.pdf
    • https://teduruperalugo.weebly.com/uploads/1/3/4/3/134320262/2bebee9bd.pdf
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5ff89a14a1650.pdf
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/polusazako.pdf
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5fe80669426fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pafexegud/rijumesugijevagi.pdf
    • https://s3.amazonaws.com/faxaxos/70941989697.pdf
    • https://s3.amazonaws.com/jobavo/handbook_of_environmental_acoustics.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_off0000dd42.bin
9ae382469ca72ed6c68917d74ebe0a077b96bb26e522a61fbe4b252dfb9d6492
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 5064 bytes
font_01_sfnt_off0000ee94.bin
a9c8438db773f206c6eefad4070893488d0ec45352f534397858a63bf2d59f97
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 10396 bytes