Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf08d41765578b9d…

MALICIOUS

PDF

89.3 KB Created: 2021-03-23 02:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 3f40db27ea5550250f5ee290c4d104f7 SHA-1: 58ca5dacb847853cc8f92f59cb2799f1e5626b99 SHA-256: cf08d41765578b9d27cb30743abd974911e1be3297aca608e27534dd45f4d4f5
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to wkhtmltopdf, indicating it was likely generated programmatically to host these 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://pelibifir.ru/wix?keyword=why+is+it+called+a+breadboard+end PDF link annotation
    • http://tokexal.medianewsonline.com/12541687195.pdfIn PDF document text
    • https://cdn.sqhk.co/milatepoz/CgiIv4v/zaxaba.pdfIn PDF document text
    • https://cdn.sqhk.co/gipirukanut/K5hgjfK/nextbike_app_price.pdfIn PDF document text
    • http://trastenmyqort.online/90894613494dbxna.pdfIn PDF document text
    • http://copyrightnotice-ig.com/wow_classic_shade_of_eranikus_guides10ma.pdfIn PDF document text
    • http://kfcrabota.ru/kenmore_70_series_washer_drain_pumpgukw2.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/44134286438.pdfIn PDF document text
    • http://ionatr.space/how_to_record_screen_windows_10_laptop42z8f.pdfIn PDF document text
    • http://gallery-shop.site/what_does_the_number_111_mean_in_lovelx9w7.pdfIn PDF document text
    • http://topmassage.net/25121189960ifjag.pdfIn PDF document text
    • http://sarhello.online/biodiversity_conservation_act_2020m49qm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_44d28920e3a94a20b1051be755e2e924.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_6a7d6cbca5ae4e3e9b51c43a7a289304.pdf?index=trueIn PDF document text
    • http://durenifujogax.myartsonline.com/bavogelobufulibagami.pdfIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_672ccea94be34905afe3d61ccddb30b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da627382-469d-4427-990e-3b1ea1c6b8d5/voremopujaxapemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3392dc2-5207-450a-9a5c-8c4653e8cd95/kefewimanebubefudar.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_9680c499d2c74a70935f1edff23a433b.pdf?index=trueIn PDF document text
    • http://guxejusoselota.myartsonline.com/aha_bls_provider_manual_2020_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445e1861-cb6e-47a1-a493-03f1b3b872a6/connect_my_canon_mg3022_printer_to_wifi.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_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 5280 bytes
SHA-256: 66b34623d76bea39a412771d7aa7230da7a74b235e87ec12a1ebe890fd835c2b
font_01_sfnt_off00012fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE7 11180 bytes
SHA-256: 4ab1f36818593befbe2689aa56d9c4f2b44358e7e7984eadab3348028af7d14f

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