Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6c7c39532cb751…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 14:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fa75a15f0a5a97188695545e40d8e59c SHA-1: ce0380174e15c0fbeeb0bd16954347d4ecb3d2e1 SHA-256: df6c7c39532cb7511eba2f889cd04a115ed20c4a163d0c7637b57f92860fb1c3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'Physics textbook giancoli pdf' and 'wkhtmltopdf', indicating a lure to disguise malicious links.

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://kuzutuzo.ru/award?keyword=physics+textbook+giancoli+pdf PDF link annotation
    • http://fajiriduxir.medianewsonline.com/nj_drivers_license_real_id.pdfIn PDF document text
    • http://cyberlife.store/malamed_local_anesthesia0210a.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/probabilidad_y_estadstica_para_ingenieros_y_ciencias_pearson_educacin.pdfIn PDF document text
    • http://site-shop.xyz/73007030175aujti.pdfIn PDF document text
    • http://finonit.mypressonline.com/michel_foucault_quotes_love.pdfIn PDF document text
    • http://item-get.top/d-link_dir-615_reset_button7nstu.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/39341511483.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/subject_verb_agreement_worksheets_for_8th_gradebsv20.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/nasebidigaduxivaxa.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/petodamizokoniveferogu9pz1x.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/dr_faustus_act_5_scene_2_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerowegujij.onlinewebshop.net/how_to_read_a_z_score_chart.pdfIn PDF document text
    • http://kagijido.myartsonline.com/xijegupataki.pdfIn PDF document text
    • http://botasalipigu.epizy.com/92974970469.pdfIn PDF document text
    • http://kulebosux.myartsonline.com/kowuvapasizimi.pdfIn PDF document text
    • http://lunupesefobe.rf.gd/96807763926.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/wijipusiserukuzifimed.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_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 5696 bytes
SHA-256: ea989c4e64c6350e32b085714174d3132e353d57260507fa86c33cd6be5663eb
font_01_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 11488 bytes
SHA-256: 42240ec61897559a829d19cb84ba09ce6496cd67a245f8bc9bc4414b1c9ce380

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