Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60dc88387d98031…

MALICIOUS

PDF

115.3 KB Created: 2021-03-31 14:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6540fa0c20b29b204e759c36931898ee SHA-1: af8a7e9bc5bc8441fb249b3966939f312662f74b SHA-256: d60dc88387d98031351eb38e97f072e878372dd1f4ed7944b718da12f027f310
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'golowaki.ru', which is likely part of a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

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 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://golowaki.ru/wix?keyword=life+on+the+reservation+brave+new+world PDF link annotation
    • http://triple-doska5.club/download_zoetropic_pro_mod_apk_no_watermark374bt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fd7c769d4334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_5fe78382ee40d.pdfIn PDF document text
    • http://mexicotop.xyz/56171395675wpe1j.pdfIn PDF document text
    • http://baltika-trans.ru/female_sex_offender_risk_assessment_tools9372s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5fde61ab61bd9.pdfIn PDF document text
    • http://trixy-matrix.space/14632517114izwft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_0e3113267a9e4f22bf1e4da3e9802221.pdf?index=trueIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_b652d80fb688403c9634750ddb14bbb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/likerajatob/39502047415.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/how_to_scan_baofeng.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16359c84-da99-4dd9-94fa-7867a67fd751/fubotarokivotola.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/11410413648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a89aabd-55a5-4e58-8ba1-7570a0c4bf99/short_summary_of_snow_like_ashes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74447e8-b5de-410b-8974-379a724ba62e/how_much_to_install_procharger.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_off00018527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18527 5228 bytes
SHA-256: 3a759619686d7c1b5939025a6ffd518288a1e40a57358616566063b8d0960a82
font_01_sfnt_off00019702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19702 12540 bytes
SHA-256: cb13ea4798d09c393ea7d17518100e5745f77e58e478c35bc14a4c9f60d6479f

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