Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bad8c25e3255821…

MALICIOUS

PDF

66.3 KB Created: 2021-02-27 01:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a873c5e187d548352715f7bf08c06aa6 SHA-1: ccfb79211c2c7135b1141889b8aecebfde8b04bd SHA-256: 0bad8c25e32558216f30ae0e9ad42f8771191cbd104a6de205c4b10bf04f3766
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one pointing to 'midufefew.ru' which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious 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://midufefew.ru/aws?utm_term=international+human+resource+management+full+notes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417305/normal_601d2b3895fa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_5fc681aaebd32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_6028b882b01cf.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/gatinin.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/ronibamoxikomijon.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/womizik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5fc9a70243906.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/12496295870.pdfIn PDF document text
    • https://xeruterone.weebly.com/uploads/1/3/2/6/132680908/ffee70682.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/can_you_breed_dapple_dachshunds.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/aGG4FgA/eagles_greatest_hits_song_titles.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
    • https://s3.amazonaws.com/godewumazek/tolelujipilanizodapetav.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/wureparuwupamepalutupu.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/44001092101.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDC 5388 bytes
SHA-256: a3a27bf29ce621cb4ef1b321604ea6a3de6665e4b660e7c70df3c9b2cde51532
font_01_sfnt_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 9084 bytes
SHA-256: b3cd65d6ccb2cefd57042e9173be652f1cef767a0ab3f4cd7d54eca09d6cb603
font_02_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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