Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0d9d3354d82f76…

MALICIOUS

PDF

67.3 KB Created: 2021-01-29 11:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5e224055de41847e7202e33459ffe5f SHA-1: e8f9132bde2c858c72bbaf11cc6f9205eafc1313 SHA-256: 2a0d9d3354d82f767ea243948a04ea2694c78ddb53228ca20ea515878ef45596
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to distribute malicious content or engage in phishing. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful external sites.

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-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://seumenha.ru/aws?utm_term=messenger+app++karo
    • https://static.s123-cdn-static.com/uploads/4384821/normal_5feb834096f6f.pdf
    • http://gufutaca5.xyz/gubefofisexu86ad6.pdf
    • https://cdn.sqhk.co/dafisuwikib/tghXf1Q/final_fantasy_xv_review_no_spoilers.pdf
    • https://cdn.sqhk.co/rufosopufu/cifzRmE/chicken_and_spinach_recipes_for_dinner_keto.pdf
    • http://opsnatur.fun/slime_maker_game_free_online8ijiz.pdf
    • https://cdn.sqhk.co/rujiwujik/eUib2Xx/skylanders_giants_3ds.pdf
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/dobufagozibedo_wimemef_fupuxazeju_wujotelunijofin.pdf
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fc952231f40e.pdf
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5fffb0aed64ba.pdf
    • https://static.s123-cdn-static.com/uploads/4459774/normal_5fe499636ca2f.pdf
    • https://static.s123-cdn-static.com/uploads/4380072/normal_5fe38a5290d95.pdf
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5ff613c189e6c.pdf
    • https://cdn.sqhk.co/puroneruk/Fidhdge/95381086388.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kinowazekuponaw.rf.gd/lol_swain_support_guide.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_off0000cac8.bin
fb2dc729908b7a05966edbdd7a74c9b919dc13fd05d84dfd80b2bc1aee0d02e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 5024 bytes
font_01_sfnt_off0000dc02.bin
00d95cca797d98c0feb737da5be4d8e97bb3e6eddb70da53a6cff7787c43f929
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 11616 bytes