Malicious PDF — malware analysis report

Static analysis result for SHA-256 401db9c0ba3b235b…

MALICIOUS

PDF

86.8 KB Created: 2020-11-18 14:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc9a3bfb58c2a45b5593e649753be706 SHA-1: 10875e6fe3513855d93e20807293034de52213b2 SHA-256: 401db9c0ba3b235b04790d630cb7798713c962a726b017540d64738b1f4f12d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used in phishing or SEO spam campaigns to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=pathfinder+2.+0+bestiary+pdf
    • https://cdn-cms.f-static.net/uploads/4380068/normal_5f8febe4bc4c9.pdf
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f8fc4bee1b68.pdf
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5fabd66993573.pdf
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/tajawowirijomosa.pdf
    • https://cdn-cms.f-static.net/uploads/4422168/normal_5f9fa03a3367f.pdf
    • https://cdn-cms.f-static.net/uploads/4404727/normal_5fa3dcc93f504.pdf
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f919e0256b7a.pdf
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5f984ef9decb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinajabizoreguf/benedictine_rule.pdf
    • https://s3.amazonaws.com/zunewidimem/76076958448.pdf
    • https://s3.amazonaws.com/zinudipir/chinese_character_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/6bd3afb9-5704-4cc8-a99d-b0aaf2e4bace/81438823299.pdf
    • https://s3.amazonaws.com/najipavez/nomenclature_worksheet_1_naming_alkanes_and_cycloalkanes.pdf
    • https://s3.amazonaws.com/tetofamuxulil/78728002978.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_off0001144a.bin
960c030df0322f5a4be41666d0bf20f9b540b0f39c490749419c76e59cf60fca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 5648 bytes
font_01_sfnt_off0001277a.bin
f2caec9fbb35387193b7b543c0a0158575d3e4182038a9116666a7fc22d4e48f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1277A 11620 bytes