Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a6a337fb94fedb…

MALICIOUS

PDF

69.9 KB Created: 2021-01-13 18:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d480c4248bf2d335a4185454ffa8546b SHA-1: d148cf9aa9f862008b03c43c19a594e668202478 SHA-256: a9a6a337fb94fedb5c7a4836c65df1d253ad89ce6da8a0178662228d177bf2bd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=theotokos+and+child PDF link annotation
    • https://xigarivopupu.weebly.com/uploads/1/3/5/3/135300822/100446332f668a.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/vWcifhd/zaxodagodonekinoni.pdfIn PDF document text
    • https://site-1177404.mozfiles.com/files/1177404/player_potentials_pes_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_5fb3f1173cb99.pdfIn PDF document text
    • https://site-1202150.mozfiles.com/files/1202150/alchemy_beginners_guide_skyrim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496404/normal_5fd7afce8369b.pdfIn PDF document text
    • https://lupoxever.weebly.com/uploads/1/3/1/4/131413766/a30c3ceffd1fab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476943/normal_5fc8833e8c555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5fc16f5f8615f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_5f8c3b2a5f584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ff36c766db8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ff06c2eb1e57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5fe1b44dd11d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 4944 bytes
SHA-256: 3e17683052fad0ec6d8f6c1636b11807caefc381a3fa239503093effeae2e73b
font_01_sfnt_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 10252 bytes
SHA-256: bf737918c066b7a13be5e1379efcd6ed69fb56c705d34433021b90777023451b

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