Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c6c41af6c44e19…

MALICIOUS

PDF

75.0 KB Created: 2021-03-10 08:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 996913c2481ebb34108b06b14a24a31b SHA-1: a406a6c2d5100b477827a8b9c2d766c89aef6504 SHA-256: c5c6c41af6c44e19aa3cd38821f96d524a2b0360ed9178b17da5cfee7ce1a9d0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

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://gimoguvi.ru/strik?utm_term=does+canon+rebel+t5+shoot+video PDF link annotation
    • http://5coupon.info/oklahoma_commercial_drivers_license_manual8yn5f.pdfIn PDF document text
    • http://sibasijiv.22web.org/blood_type_a_diet_list.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/haicgiM/xiwutadaxo.pdfIn PDF document text
    • https://megevoweroke.weebly.com/uploads/1/3/5/3/135351245/rumatofu_narararivejuf_fesabol_nukup.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/jbzgfhf/old_defender_car_for_sale.pdfIn PDF document text
    • https://rurawovupotoli.weebly.com/uploads/1/3/4/0/134017211/kosonetepube.pdfIn PDF document text
    • http://1xbets-reg.site/piwudukowesotugevebipixezr3zrx.pdfIn PDF document text
    • http://itsamorem.com/ancillary_justice_book_club_questionsmk2bp.pdfIn PDF document text
    • http://fapevenaxopaw.22web.org/fefemesutibipuni.pdfIn PDF document text
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/wetidebepupotexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f894e15-41fa-4df6-b4b8-23dc5620aa2f/kiniwewil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fef485f-7ed1-4926-8f1c-dfa66dc6a421/long_john_silvers_nutrition_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb58549a-4d77-4d3e-a16f-c02c6512be0f/18408499695.pdfIn PDF document text
    • http://koxikid.epizy.com/10794792695.pdfIn PDF document text
    • http://gotazuvibidok.epizy.com/the_goldbergs_episode_guide_tv._com.pdfIn PDF document text
    • http://jekewakus.epizy.com/bivag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc07c5f9-d7de-4cbe-a7cb-548355d56b36/physics_principles_for_high_speed_collisions.pdfIn PDF document text
    • http://xuwarojuvewibi.rf.gd/dewurajivizikewopikovokid.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 5352 bytes
SHA-256: 360e9321dd5daa3e1d5da72d54fb7eeaaa36f766e6327bdf61dedf7d2c17f95b
font_01_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 10936 bytes
SHA-256: 30b244b4eccb7156b7e1e9eaa12b4e23a0687d53c1d69ec22f6e5bee37a10abb

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