Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bfc410d3db7796…

MALICIOUS

PDF

67.9 KB Created: 2021-04-02 01:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cdeeced95557e2c9727d78a0de5a3a7 SHA-1: 1612278d59bc9f79365b7cbbd6bb017c16dab7d9 SHA-256: a2bfc410d3db779688ab49b950d96d45fbbd92321cd929997a9a4e3610cb73a4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. Heuristics indicate it's a non-clustered link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing attempt to redirect users to malicious 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://nipisod.ru/award?keyword=il+mulino+di+amleto+pdf+download
    • https://cdn.sqhk.co/dasotipamu/jTPtUJ3/real_chess_online_for_pc.pdf
    • https://cdn.sqhk.co/mejofiwog/kjeEgfa/swiper_new_friends_on_snapchat.pdf
    • https://cdn.sqhk.co/kubizevomedi/dd56Phb/32127489479.pdf
    • http://reweder.site/what_does_bible_says_about_lonelinessnyo2x.pdf
    • http://fejukoturig.medianewsonline.com/relabumetu.pdf
    • http://dronextactical.xyz/a_certification_for_dummies_4th_edition2h87m.pdf
    • http://lagidonak.mygamesonline.org/wulagexo.pdf
    • http://mamuxorap.getenjoyment.net/xalovikilirerotet.pdf
    • http://jabudapitu.scienceontheweb.net/poxazukes.pdf
    • http://tiwujatujoput.mygamesonline.org/different_branches_of_social_science.pdf
    • http://tetiviguxawik.getenjoyment.net/dominic_benhura.pdf
    • http://zabemaladameg.medianewsonline.com/pdf_annotation_app_for_android_tablet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6e023052-296a-4c74-a049-806d2c375561/69136084613.pdf
    • https://uploads.strikinglycdn.com/files/5d5f98ea-6a76-4219-80a7-de0e5efce1d4/bradesco_seguros_auto_sinistro.pdf
    • https://uploads.strikinglycdn.com/files/2864b2d9-4714-4d2c-a315-e0c97aa6915d/wuwemexogunisutukitamiva.pdf
    • http://kaloruligot.onlinewebshop.net/communist_manifesto_book.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_off0000cdd3.bin
150696398e41aa41927ae76f767cf73b2e38b1f8d106f2212c3fa4a420ac94f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 4940 bytes
font_01_sfnt_off0000dea3.bin
58443f97965549bee99a528b65af4503d6ff9be02970fd083c982f0033806d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 10476 bytes

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