Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bd6bab0f9cb7cc…

MALICIOUS

PDF

103.6 KB Created: 2021-03-04 06:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: af52238fd2f96304dde5510f18826086 SHA-1: 46b26549c0d49bb5e7d2b098c22f2b113ac63aac SHA-256: 98bd6bab0f9cb7ccc497753fdc873210f3763bb81a6368045bac94d44584fb0d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt 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://vilenefex.ru/123?utm_term=can+i+charge+my+rca+tablet+with+usb PDF link annotation
    • http://bebetadiruj.mywebcommunity.org/what_is_pilot_arc_on_a_plasma_cutter.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/echo_gt-225_weed_wacker_parts.pdfIn PDF document text
    • http://gatigade.iblogger.org/pugixufusewoxojonej.pdfIn PDF document text
    • https://lutaxabivuk.weebly.com/uploads/1/3/0/7/130740512/watevogagox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5fdafffeadfbd.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/IjggdZO/88952061267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_600f142f0c9cd.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/22585089631.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/begijufadi/susinipejijaxebewa.pdfIn PDF document text
    • http://rodisasedozax.myartsonline.com/the_raid_redemption_movie_download_in_tamilyogi.pdfIn PDF document text
    • http://sexikiti.epizy.com/1665985080.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/x_factor_uk_fifth_harmony_performs_bo.pdfIn PDF document text
    • http://bavixefavidevok.epizy.com/fifonirekubodegab.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/56547245591.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/12815081303.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/dututumolezimurudav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 5452 bytes
SHA-256: c2b6c433e4e4beb5e655c8a82f43f855b54688ccfce182bd69644c0bb91731e7
font_01_sfnt_off0001487c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487C 16764 bytes
SHA-256: 01ef0bbb40b31ce78ee08d519703d59ea0d6ec570b3dac5e3daf8425812ec9bb
font_02_sfnt_off00017a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A24 16116 bytes
SHA-256: 26fb4f0bc99519a77594008f3454f506010ffea8c5f25222f1522364155dfd62

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