Malicious PDF — malware analysis report

Static analysis result for SHA-256 8230552c6eb392b0…

MALICIOUS

PDF

76.2 KB Created: 2021-02-11 02:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 01b108ba963d9e83bde4221b116e3f8d SHA-1: 22bdf8eaf44cd753beb101ba9bd49d7c3451415c SHA-256: 8230552c6eb392b033d4f4ab138090a9cfdba02e3f0efee2fc83debe75e51be5
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 external links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed 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://baarspo.ru/123?utm_term=ufc+190+free+online+card PDF link annotation
    • https://cdn.sqhk.co/nivuduful/BTidGgk/asme_ix_2019_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/PKcCgjG/79592972033.pdfIn PDF document text
    • http://fastpysystem.online/togu_challenge_disc_2._04h8r3.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/jotexijirenefegarildxxh2.pdfIn PDF document text
    • http://shopmzm.site/49706118926y3get.pdfIn PDF document text
    • http://tamakar.tech/neuron_activation_meme4xos1.pdfIn PDF document text
    • http://kneeksi.ru/advanced_lightsabers_v2ly3y7.pdfIn PDF document text
    • http://zarabatyivat.ru/2019_telugu_calendaru5801.pdfIn PDF document text
    • http://xabidewukolesas.66ghz.com/94257808387.pdfIn PDF document text
    • http://usmileofficial.site/blood_money_lyrics_lil_darkie33dgu.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/fgDklJM/retrovirus_life_cycle.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/dagejozu1jm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450730/normal_6003960a1606f.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/ohfN8hh/5692278610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529149/normal_5ff909339ee8f.pdfIn PDF document text
    • http://zaralutodunuwa.66ghz.com/end_of_school_report_card_comments.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forofadikov.rf.gd/bahut_sundar_photo.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/naxijenufuwenuxevoz.pdfIn PDF document text
    • http://lezogowoz.rf.gd/antigen_specificity.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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 5176 bytes
SHA-256: caa79b9405d9620752f0e66cb88749a39311a6472c96d37fd929de9e46e15716
font_01_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 11380 bytes
SHA-256: 17a1fa7ec07d53fdfeef6deea949b21b86066988c03a91b04e5ceb9fc5680795

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