Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faf2641f87fcb34…

MALICIOUS

PDF

105.5 KB Created: 2021-02-24 06:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c3c3f862100b7b681a7718a734a403b8 SHA-1: e54b2bb94f671a464bfce35befec8e0823cdc785 SHA-256: 3faf2641f87fcb3445fa3f4d3f84650b0e899743dbd7e53eba88bd807491a859
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://leonvi.ru/strik?utm_term=how+to+lose+weight+throughout+your+whole+body', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=how+to+lose+weight+throughout+your+whole+body PDF link annotation
    • https://cdn.sqhk.co/sadopore/Eqmjahg/mafuvavinosikividog.pdfIn PDF document text
    • https://rujizubag.weebly.com/uploads/1/3/0/7/130776042/329699.pdfIn PDF document text
    • http://petersikdar.com/631566010602w177.pdfIn PDF document text
    • http://qwert-ita.fun/kenmore_stackable_washer_dryer_front_panel_removalqwd48.pdfIn PDF document text
    • http://yourcy.com/crash_course_world_history_7_worksheet_answersb3s6x.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/c2d6e338b49388.pdfIn PDF document text
    • https://xuzopodoker.weebly.com/uploads/1/3/0/7/130738955/xowulosit_waxoruxivur_pexaxu_dowarivivaper.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/ghihcii/stick_it_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/nudofarus/kiegjif/legends_of_football_hall_of_fame.pdfIn PDF document text
    • http://help-verification.com/abecedario_con_dibujos_para_imprimir_letra_por_letrayc245.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/zU3Vjei/potion_mixer_game.pdfIn PDF document text
    • https://cdn.sqhk.co/raratajuxu/CgegcAY/dinghy_towing_guide_2011.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/d9327cc5b.pdfIn PDF document text
    • http://vittorguxx.site/66464464219z0ce0.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/UiNx9u7/duzewe.pdfIn PDF document text
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/sibikigumulov.pdfIn PDF document text
    • https://sulovuve.weebly.com/uploads/1/3/5/9/135973568/wajumuf.pdfIn PDF document text
    • https://zunudomulu.weebly.com/uploads/1/3/4/6/134604261/1113041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E2 4948 bytes
SHA-256: 84d09158f5cce1f74d3979625490f7c79b22f7338a02c9fae43d366545934023
font_01_sfnt_off000164df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DF 10884 bytes
SHA-256: 01424f9696ab8c8ac7aea836e6fb65042c22a724e902e834f845965f2a7ce2d5
font_02_sfnt_off00018a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A09 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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