Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9afbc2b0fb4cd94…

MALICIOUS

PDF

72.3 KB Created: 2021-04-11 08:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe494c558a9ba6a5b326a26ba67e8a09 SHA-1: a0df3ee628ceb0710aeb0ebd634a4aa77ec5ba35 SHA-256: c9afbc2b0fb4cd94f282e6f793a0a2cff0a3271b53195ceba27c39c16c21e9c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or redirection mechanism. One prominent URL, https://bologen.ru/strik?utm_term=how+to+help+a+child+with+adhd+succeed+in+school, is likely used to direct users to a malicious site. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

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://bologen.ru/strik?utm_term=how+to+help+a+child+with+adhd+succeed+in+school
    • https://cdn.sqhk.co/vaminika/2DAtYaw/turbocharger_vs_supercharger_pros_and_cons.pdf
    • https://cdn.sqhk.co/rowemarul/jsxCB0q/oscar_fish_tank_mates.pdf
    • https://cdn.sqhk.co/gepabafi/Dphbdha/14786147479.pdf
    • https://cdn.sqhk.co/jekenilegefe/ShgGd7H/offroad_car_simulator_3d_mod_apk.pdf
    • https://cdn.sqhk.co/magatile/fgdjjQR/26397914492.pdf
    • https://cdn.sqhk.co/vonirosidejo/a5ieQjb/fokemuxifakixavali.pdf
    • https://cdn.sqhk.co/xobevopu/hgDhegh/food_authority_recruitment_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4449009/normal_5fe77a16ed4c3.pdf
    • https://cdn.sqhk.co/vipabumumiw/hiidSjg/18365379454.pdf
    • https://zowemuxojawoput.weebly.com/uploads/1/3/4/3/134357794/f20c0288.pdf
    • https://cdn-cms.f-static.net/uploads/4481834/normal_5fe66a6895349.pdf
    • https://cdn-cms.f-static.net/uploads/4376086/normal_60186afa75126.pdf
    • https://cdn.sqhk.co/reromiwo/jfeFjg5/44758114688.pdf
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/6fb81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_ab5fc5e6e9534014a21a3abacaa384cc.pdf?index=true
    • https://d9e21584-559d-470c-b0e9-829a80f361fa.filesusr.com/ugd/989f82_d1904de0b0fa4dfdbe3e4d0a18b9d44c.pdf?index=true
    • 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_off0000dda7.bin
134d3cf76ecf4cb01ae0cb7af1a1cb174afd965b93ee7f22b4ef2536c6e8a88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 5120 bytes
font_01_sfnt_off0000ef1d.bin
b6051091ba8f3a2797aed31eb2a9187dfe39f7cdc7775b0fd4fbacb72c00f384		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 10780 bytes

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