Malicious PDF — malware analysis report

Static analysis result for SHA-256 6407945080e6de2b…

MALICIOUS

PDF

70.9 KB Created: 2021-02-26 12:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 46c310c53b479a43c192c6f67961838c SHA-1: e683273045b237098d14d7fb085fb25bdfa98b7e SHA-256: 6407945080e6de2bda2cd26a41d6d13e1d99c1b0fac139633027a4ad859678a6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities or contains malicious content. It functions as a link farm, embedding numerous external URLs, with a significant number pointing to disposable hosting services. The primary purpose appears to be directing users to potentially harmful content or facilitating SEO manipulation.

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=que+es+composicion+corporal PDF link annotation
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/gezetibuzenima_kipudaruw_wadoja_muxako.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/lIIgdZT/97262604290.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/35922.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/3338848.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/ijbSbQo/boo_2020_lineup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_6032cc2c873b0.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/HgiQihr/renudikifedoko.pdfIn PDF document text
    • https://rudarizegofuk.weebly.com/uploads/1/3/4/3/134355262/0afb4dc.pdfIn PDF document text
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/9694431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467571/normal_5ff6d1a8c7b30.pdfIn PDF document text
    • https://kemipopebu.weebly.com/uploads/1/3/4/5/134585234/savezirufo-dituwixor.pdfIn PDF document text
    • https://cdn.sqhk.co/nutakurij/jjRNahi/general_tso_recipe_without_hoisin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5fcce24301b3b.pdfIn PDF document text
    • https://dujeranisijoku.weebly.com/uploads/1/3/0/7/130776063/tuposadijisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_6022eb0629dd3.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/2gdjf1v/catchmaster_insect_trap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/game_naruto_shippuden_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/zoo_animals_coloring_book.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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 5140 bytes
SHA-256: 864d645b4d90a20a3f16aea5579c0f7a9019b1d8e08b6fad779edc7d80dbf848
font_01_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 11920 bytes
SHA-256: 13d58001ca34698a13d4737f0a4e7caea8166435f9798d8c31c929377c84719a

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