Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e59a1b6e6b15f06…

MALICIOUS

PDF

89.7 KB Created: 2021-03-18 07:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b568b29ef1fe8f2577a2cb4481db546e SHA-1: 13aad5317a08ea9d566710ef5938a3ce8e67c677 SHA-256: 8e59a1b6e6b15f0678a1172955839eec201a6785f9e1e1d284c00eb7e2cb9624
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, "https://zajinet.ru/strik?utm_term=where+to+get+rid+of+old+clothes+near+me", is presented as a search result, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=where+to+get+rid+of+old+clothes+near+me
    • http://vizexibidoxi.getenjoyment.net/10368579654.pdf
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5fd787c7bf727.pdf
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/6134110.pdf
    • http://power-guard.shop/distributive_property_of_multiplication_worksheets_with_answers1pfsa.pdf
    • https://cdn-cms.f-static.net/uploads/4409826/normal_604828114ae90.pdf
    • http://kukushpa.fun/mechanical_engineering_salary_houston_texas2y62n.pdf
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/mazukexifudi-sivanimep-kijepiriturikud-mugofuwujuran.pdf
    • http://help-ruleviolation.com/aspiracin_de_secrecionesmn4r0.pdf
    • https://jategolotigani.weebly.com/uploads/1/3/4/8/134882723/6526564.pdf
    • http://zoompol.xyz/54152517150l4skt.pdf
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/3977992.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/xusuvibo.pdf
    • http://zugugalepew.mypressonline.com/1605157297.pdf
    • http://eu-study.ru/wings_of_fire_book_8o2vxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xesigeze/felutivibem.pdf
    • https://s3.amazonaws.com/jukoxisojow/49331401706.pdf
    • http://maretubozewugi.myartsonline.com/dake_annotated_study_bible_large_print.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_off00011db8.bin
5a54a40e7ec2e63343641e76abdf12873035bd67807a3c2631e59e50bbb7a0f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 5448 bytes
font_01_sfnt_off0001302c.bin
cd0398651400cb340aac6d77bcb1bf9b6728c9fb0726ef1b06cebe2a31a8c9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1302C 11964 bytes

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