Malicious PDF — malware analysis report

Static analysis result for SHA-256 5307fe72409ea2ea…

MALICIOUS

PDF

81.4 KB Created: 2021-02-19 07:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eafbb8374985a817455f6e6b0965e44a SHA-1: 14ff49049b28ec3b316e82ed338d7483e7a11e61 SHA-256: 5307fe72409ea2eaba0b00a08e082c9fd0be609f541e93e80a7dfd776e9c7de2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/123?utm_term=are+wall+ovens+a+standard+size PDF link annotation
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/gofulabi-kawizu.pdfIn PDF document text
    • https://zivozisexime.weebly.com/uploads/1/3/2/8/132814465/4b5c9ad78728e8.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/fhdfgeV/sijoker.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gnyigR6/dragon_ball_z_stickman_mod_apk.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/194263.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/ricjghi/ink_inc_tattoo_drawing_apk_mod.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/modov-rikakepiso.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/hhijgeu/dakum.pdfIn PDF document text
    • https://wilumixomili.weebly.com/uploads/1/3/1/4/131483065/6496643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijiwag.epizy.com/algebra_1_exponents_review_answers.pdfIn PDF document text
    • http://sarupuxev.epizy.com/rebefijemor.pdfIn 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_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 5012 bytes
SHA-256: 6ecab77a9d96f1167690b31badf4efd24ff1a2a383ee4743947cedec9d6713bd
font_01_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 10872 bytes
SHA-256: 1dc0489f11793e009919e3f4a420de630a7d852dab0ca6940f93e0a1ecbbbcec

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