Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4df0f049dce989b…

MALICIOUS

PDF

100.1 KB Created: 2021-03-14 14:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bb0e04f92026658d4bea5430d47af185 SHA-1: 941bbb15d24ab7cdf3f4b52867535ac7e210c92c SHA-256: a4df0f049dce989b11d81cadf5ece8047fad8f3cc95b539cf2eea6982fb53d23
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, specifically as a phishing trojan. It contains an embedded URI pointing to 'fokemale.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/strik?utm_term=the+culture+code+clotaire+rapaille PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413583/normal_60438a33a2a07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_601fff0c1afc4.pdfIn PDF document text
    • http://ostanni.fun/pathfinder_kingmaker_fighter_weapon_trainingbntws.pdfIn PDF document text
    • http://shmelev.pro/40810323640bf62a.pdfIn PDF document text
    • http://sks-expertiza.ru/bose_quietcomfort_30_manual7454b.pdfIn PDF document text
    • http://reassurez-moi-fr.info/bisazidutexotefiuyku4.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/92588415214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480408/normal_604137b173893.pdfIn PDF document text
    • http://profapp.pro/how_to_set_up_my_masterbuilt_electric_smokero2xpq.pdfIn PDF document text
    • http://stavki.link/avaya_2420_firmware_upgraderer3j.pdfIn PDF document text
    • http://pubguckazan.com/kenmore_mini_ultra_sewing_machine_manualoylr6.pdfIn PDF document text
    • http://frukt.fun/nimazekuwunuberune2t6sz.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/how_much_does_it_cost_per_day_to_run_a_dehumidifier.pdfIn PDF document text
    • http://bigops.fun/t_pain_ft_akon_bartender_mp4g0a0z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_60332bfdc4d66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d3f9e08-04ff-44fd-9ea7-26bf16725801/john_deere_lt160_parts_ebay.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/rifoxadik.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/xezujiworifimutudutebate.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/the_glass_bead_game_audiobook_free.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/mcq_biostatistics_in_public_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e8c0cb-7cf8-47a8-90be-50a003298af8/the_painted_bird_full_movie_watch_online.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/what_is_the_best_free_bible_app_for_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f808f95-dd75-491c-9e65-ed49c28014ca/samsung_bd-p1590_remote_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 9548 bytes
SHA-256: f795aeb36359dbdf335be825bdb88d02ebcc5aac33cd291c0dfb31aea41b8f24
font_01_sfnt_off000149c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C2 4932 bytes
SHA-256: 794666d3c2b2a8fdaecea13cfaabd272dc5c1552dc82e987839f17d0163527c6
font_02_sfnt_off00015a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7E 11332 bytes
SHA-256: a982e0a7fa8710270c9b73e60b2c5b59076a0067077d1d7a8df0bc4251e42e41

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