Malicious PDF — malware analysis report

Static analysis result for SHA-256 89507dd480cb9cd7…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 20:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1b288d2ec2ff395519aa57a6fe3b59ae SHA-1: ee5afd3d501265870f70085b29851f99e71f9ed5 SHA-256: 89507dd480cb9cd7b69911107f55a38d8778e504f75e57e096f84ed7af2f601c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=is+sears+repair+still+open PDF link annotation
    • http://wusodopepufex.66ghz.com/a_p_name_images.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486975/normal_6037f38aaa273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_6002b912d0df3.pdfIn PDF document text
    • http://lavka-karamel.ru/vozagaxj9zq.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/7687697.pdfIn PDF document text
    • http://waxinexedodupij.22web.org/interrogative_adjectives_worksheets_for_grade_5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5ffe254f8b5a3.pdfIn PDF document text
    • http://tujugataro.22web.org/resaresataj.pdfIn PDF document text
    • http://xobuxok.22web.org/eye_of_the_beholder_dd_download.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/cd4c5871.pdfIn PDF document text
    • http://tofabukusakuni.22web.org/organizational_chart_template_powerpoint_free.pdfIn PDF document text
    • https://vexitibivomak.weebly.com/uploads/1/3/0/9/130969710/204174.pdfIn PDF document text
    • https://dikarofojosej.weebly.com/uploads/1/3/3/9/133988548/faxaparoti.pdfIn PDF document text
    • http://jugixemetofun.22web.org/jemezixuguma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suxukapuvajobe.epizy.com/what_is_1-3-1_zone_defense.pdfIn PDF document text
    • http://zevideto.rf.gd/phet_forces_and_motion_worksheet_answers.pdfIn PDF document text
    • http://jedajokojar.epizy.com/istss_ptsd_treatment_guidelines.pdfIn PDF document text
    • http://lokemuwebofeg.rf.gd/the_aristocrats_2005_movie.pdfIn PDF document text
    • http://viruvivena.epizy.com/are_all_uppababy_vista_double.pdfIn PDF document text
    • http://rajimorix.rf.gd/dogobenomomanevebapix.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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 4748 bytes
SHA-256: e1537494e0574a7cb9540e1090b8cd4a601201b8f090d66cc7bca07105bbf91e
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 10672 bytes
SHA-256: bf9cc6573eced804f340b97d1cafed19e5a8cd3d4c34cb8cf6685314da96711c

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