Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f239da4f247058b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-16 06:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b57dd749497bb92274ed3228ed2bddbb SHA-1: a1b81c76038172495744e5fcc82aaf54f9e4a636 SHA-256: 3f239da4f247058b1653844d7e6b66763adafabce2966b5c6ac5594b2f641691
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and a heuristic indicates it's a link farm designed to redirect users. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/123?utm_term=news+broadcast+after+effects+template+free PDF link annotation
    • https://cdn.sqhk.co/sekigizakeku/Hifib4i/harvard_business_manager_online_lesen.pdfIn PDF document text
    • http://losqutoq.online/fagusadujutasuxobum9dpk7.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/fE4BJij/studio_photo_editor_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_5fe8ad6b8a6eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_5ffd9e1d2e053.pdfIn PDF document text
    • http://likelid.xyz/the_best_satisfying_slime_videos1ges3.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/iiPB5jh/home_assistant_devices_best.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5fe2d71e4c2df.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/bVlhfhg/real_car_parking_simulator_car_driving_academy_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_604700daabf82.pdfIn PDF document text
    • http://agent-ritual495.online/rafunigabusovudekagomo1eixa.pdfIn PDF document text
    • http://rollernefritmassage.xyz/9007932773860i1y.pdfIn PDF document text
    • https://cdn.sqhk.co/mobubivifa/hb0hiia/bayam_oru_payanam_movie_tamilyogi.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/Bkjigem/23759178948.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/eSu0RaQ/27296962966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_604d327abcdab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/the_love_you_left_behind_lyrics_meaning.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_5b43db96423e46e5aa4bb58b155e83bc.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_e32d4a2e443d40d39608ab2c6d200899.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_f5e1cbff13af4259ab0bb14090b011a3.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_855e427480324bf7a9468ac2cad6baa7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/boat_trailer_bill_of_sale_template_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/tukogabererogeradapukuka.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/12649222894.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_b0eb78a006d345a1b45502f8865a734b.pdf?index=trueIn 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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 5500 bytes
SHA-256: 51adf0925189063a67b53298e405a83b0c5b29e0be47123fbcf526cc88dd15a4
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10780 bytes
SHA-256: c224f25f989aff370b5e8d4c5efe8bf87b96abf68dca8a1bf6e16a0472200347