Malicious PDF — malware analysis report

Static analysis result for SHA-256 74452bca4910000e…

MALICIOUS

PDF

71.2 KB Created: 2021-02-19 00:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: db54104b915f248e4d516b3d11d2d65d SHA-1: 65f81c353f08160c202a39b57ab61b0b929c0cac SHA-256: 74452bca4910000e7dd5fcc7716d6e015d2117efff9f74468f2cf7ddd87cac2f
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure. The primary malicious URL identified is yafferge.ru, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains text related to drawing anime bodies, likely a lure to disguise the malicious link farm.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=easy+how+to+draw+anime+body In PDF document text
    • https://cdn.sqhk.co/jenetuwuda/gkggOqT/border_lights_bedroom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_60291a80ec6e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419827/normal_5fe3eca0500e1.pdfIn PDF document text
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/3b439140b53c.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/dobeguvak.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/Vhi2gfN/derailed_movie_2019_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_600751ac1df6f.pdfIn PDF document text
    • https://cdn.sqhk.co/vexavudakepa/dlVGzhg/business_administration_accounting_job_description.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fcbda10bc3ba.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/agcAgeJ/vivabopufevixepo.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/ieWzjaw/xexibiroriri.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/c9Fgf88/nebosajiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/XChgigd/first_aid_kit_emmylou.pdfIn PDF document text
    • https://kixarazebeda.weebly.com/uploads/1/3/0/7/130776474/fojovifurawet-zituz-fubab-xidokebune.pdfIn PDF document text
    • http://krokoboko3.xyz/average_speed_and_average_velocity_worksheet_answers3b2ep.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/99d3c.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/ihMBlig/pictoword_level_83.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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 5324 bytes
SHA-256: 4cbd7fe5cfee694e6b630672a448ab7c59d09adb486af8c4e2db92c3bfdbb334
font_01_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 10408 bytes
SHA-256: 9b6c3ced7b45a71d67cae0223e23bf9362f366084023949c8af2eeee2e289bbd

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