Malicious PDF — malware analysis report

Static analysis result for SHA-256 946642e044f09d13…

MALICIOUS

PDF

71.4 KB Created: 2021-02-21 17:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b73e2ffa623c7110c9fff8c3dcb0e3a7 SHA-1: 5e038a533b1feb8ff56391dfcf53d85a59d1df47 SHA-256: 946642e044f09d13e2868c4ad9f4676b9ac67bd698da3c0d2ab0fc124912cd1a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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+adjust+acer+monitor+stand PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404750/normal_601055fdda908.pdfIn PDF document text
    • http://juvugewit.iblogger.org/confession_augustine.pdfIn PDF document text
    • http://es50off.pro/dragon_matte_liquid_lipstick_reviewtkd7r.pdfIn PDF document text
    • http://vivoxasoro.22web.org/91592958342.pdfIn PDF document text
    • http://axecheat5.xyz/westinghouse_40_inch_tv_problems566w0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5fd13a3e64c81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujugune.rf.gd/free_printable_my_little_pony_colouring_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/bigogaluwobobi.pdfIn PDF document text
    • http://fetevatakipip.epizy.com/22338805441.pdfIn PDF document text
    • http://dunupilopun.epizy.com/jolomiluvejop.pdfIn PDF document text
    • http://terojujulemon.rf.gd/jepep.pdfIn PDF document text
    • http://suwojubomitela.epizy.com/slide_sheet_for_bedridden_patients.pdfIn PDF document text
    • http://mudivakerimenog.epizy.com/free_email_bridal_shower_invitation_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/musidazosagukefukoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/61217517528.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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 5184 bytes
SHA-256: b92c0b16f2aa99cbdf1ed9b0dc140736f8785259128faf826cce4bb7e32d8d07
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10568 bytes
SHA-256: 22c14c4a4a4e76c1446e00c5b319e1199d5d745d26396a0b0b52aa3e360c8ad1

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