Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42eb2c8ffdcd830…

MALICIOUS

PDF

82.1 KB Created: 2021-04-03 08:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02b631cb6fdf1ccba21d635dc90eae7f SHA-1: 787188246999239ae228d5469afbbd2440196188 SHA-256: f42eb2c8ffdcd830359753a5e628209ded743750a8a44e024dc749c27a22da13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection strategy. The primary malicious URL identified is https://nipisod.ru/strik?utm_term=el+arte+de+amar+resumen+de+cada+capitulo, which likely serves as a landing page for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=el+arte+de+amar+resumen+de+cada+capitulo
    • https://cdn-cms.f-static.net/uploads/4487623/normal_6039c055215b3.pdf
    • https://cdn-cms.f-static.net/uploads/4403805/normal_6041d7b095d42.pdf
    • http://bajifepeselok.sportsontheweb.net/bpsc_65th_answer_key_download.pdf
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fe4d633a79c9.pdf
    • http://kadesevi.iblogger.org/58536318159.pdf
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fca67056de5e.pdf
    • http://extrameets.fun/kedufobezikeguzeduzudixatneqn7.pdf
    • https://cdn-cms.f-static.net/uploads/4460944/normal_60193094c4769.pdf
    • https://cdn-cms.f-static.net/uploads/4476582/normal_6035527fb249b.pdf
    • http://uaportal.site/primer_androide_de_dragon_ballq355f.pdf
    • http://lozhobelir.space/play_store_apk_directww7v2.pdf
    • http://zixudivibudizu.scienceontheweb.net/luwup.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd61c9b484b6.pdf
    • https://cdn-cms.f-static.net/uploads/4484103/normal_600fd55382235.pdf
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5fe91f2aa5092.pdf
    • http://intereriia.com/nikon_d5100_manual_focus3q81f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_3cda4dbf7990420188fb432ef1bfa018.pdf?index=true
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_99e3283628c34dcfa4f14f1d3d659717.pdf?index=true
    • http://duvodix.myartsonline.com/where_to_buy_edenpure_heater.pdf
    • http://jupefavasareje.rf.gd/narrative_of_the_life_of_frederick_douglass_sparknotes_quiz.pdf
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_e0824ff1e5854811a4a6f5a2a6ab468e.pdf?index=true
    • http://paritoxo.rf.gd/geparurabo.pdf
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_dafd4446ba0f479db69ebd24955374c1.pdf?index=true
    • http://basatesizisil.rf.gd/car_values_glasses_guide.pdf
    • https://14579757-8399-40ae-9aa0-1c510f02119b.filesusr.com/ugd/5613ee_c1b54e0f6f354b0884dfdba5c70ce47d.pdf?index=true
    • http://kodireso.epizy.com/dokozugefemixesakusa.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_off000101c6.bin
b1d5b36c57e7fc8f708a7c2fb81c5b425c0086471836f86b22a010b5ab32cc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 5176 bytes
font_01_sfnt_off0001134c.bin
4ef91dddf6956a09134011900d55d395b74dbbe26b6b17f21b693570a8d057fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 11464 bytes

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