Malicious PDF — malware analysis report

Static analysis result for SHA-256 a253a8e5c79503e3…

MALICIOUS

PDF

79.0 KB Created: 2021-03-02 12:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c3d8050bb6e96b0462bb13bd73f7d9c SHA-1: 75ca9a80977d5b45888a81de485afe046ce97a95 SHA-256: a253a8e5c79503e38314c2c2949cbc5accb0018915861fd287c26a1f4484759b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be part of this lure, aiming to redirect users to potentially malicious sites.

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://dugedepap.ru/strik?utm_term=a+book+of+luminous+things+an+international+anthology+of+poetry+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457318/normal_60274315ca8d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_5fd7676d4110b.pdfIn PDF document text
    • http://exampl1214.com/gufixigypq1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_5fd327d7550b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_6013f0529fed9.pdfIn PDF document text
    • http://seomagnat1.online/neburefoporolugip7f031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408586/normal_5fcf857bb238f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_603d8bb8d5cda.pdfIn PDF document text
    • https://motedozanegiraz.weebly.com/uploads/1/3/1/3/131383309/5623670.pdfIn PDF document text
    • https://tikomonanuso.weebly.com/uploads/1/3/4/2/134266270/1af060c88e.pdfIn PDF document text
    • http://miridudab.iblogger.org/muvibudedarab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_5fd3ce4bc6f1e.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/eHeYTts/free_real_world_football_cup_games.pdfIn PDF document text
    • http://lotsmen.com/report_for_deletionwshhz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5fcb1201c6608.pdfIn PDF document text
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/zutimuroluxidi.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/qrebejd/65001612246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5ff04124efb0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 5748 bytes
SHA-256: 27371c05d96badf09d46b27c6241b63e02875de1661ebd9ba4f45eff3e70d568
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 10540 bytes
SHA-256: faef1b0af703bcee6a1fd41f14b3e65d1cbe95193631928ffd87ea510610c01a

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