Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0dbdb2bcaeddb1…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 20:24:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b27e335e54f9ffe679615211aab96cd SHA-1: 4b2012bc2e6bc8426c5e092320ccf7ec903b2daa SHA-256: ca0dbdb2bcaeddb198abfed30c031134305295109ae7a906f9c8dc6054654d43
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=which+country+has+the+largest+economy+in+asia
    • https://static.s123-cdn-static.com/uploads/4443619/normal_60082c2a3d0ea.pdf
    • https://cdn-cms.f-static.net/uploads/4471710/normal_604acf16b3afb.pdf
    • https://static.s123-cdn-static.com/uploads/4501775/normal_600157e191878.pdf
    • https://cdn.sqhk.co/kawiwitifa/FZzheic/66558261031.pdf
    • https://jaravexogozene.weebly.com/uploads/1/3/4/0/134041495/julawijufam.pdf
    • https://cdn.sqhk.co/zefipuvuwifi/9dDhbwB/wugipelemisedixofigateb.pdf
    • https://static.s123-cdn-static.com/uploads/4475872/normal_5fee042aa934e.pdf
    • https://cdn.sqhk.co/ramidazumiko/higojf4/fabfitfun_customer_service_number.pdf
    • https://cdn.sqhk.co/masamiwe/5CUjjM2/best_forex_trading_strategies_that_work.pdf
    • https://cdn-cms.f-static.net/uploads/4382629/normal_600dd894f30f5.pdf
    • https://cdn.sqhk.co/pevukoza/gdJR8mp/cardboard_box_fireplace_diy.pdf
    • https://cdn.sqhk.co/towinomer/djggi6t/50758070624.pdf
    • https://cdn.sqhk.co/sixepatexup/iihdujh/saxut.pdf
    • https://nevuvipegigi.weebly.com/uploads/1/3/4/5/134589722/5079834.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/varolexexus/android_9_su_samsung_s7_edge.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/penopaxuripusozup.pdf
    • https://s3.amazonaws.com/gonima/hyperx_alloy_fps_rgb_user_manual.pdf
    • https://s3.amazonaws.com/janodojivi/christopher_paolini_eragon_book_5.pdf
    • https://s3.amazonaws.com/sigobija/how_many_calories_are_in_a_dunkin_donuts_bacon_egg_and_cheese_breakfast_wrap.pdf
    • https://s3.amazonaws.com/vavale/bulepe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f116.bin
d8d49d10a5ce5b927454fafa2cd681619db749e69a8aa3f95b5a3685938dd61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5328 bytes
font_01_sfnt_off00010320.bin
a9372ca282529e90dffb9308099f2b0d040c9ad9c454b773749539cb714a4af0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 10720 bytes

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