Malicious PDF — malware analysis report

Static analysis result for SHA-256 79701857aaefea6e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 02:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bbdcebb00e1a65109f410df3100123df SHA-1: 9fd0a27bbe6be8fc24a87f1b796e221dbb976e27 SHA-256: 79701857aaefea6ea6ba37a8b033a526bb533cedec7cbe139d66c339e5c5f10e
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting services. Heuristics indicate it functions as a link farm, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded URLs being the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://vilenefex.ru/123?utm_term=the+question+of+animal+culture+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416140/normal_604d49a86538f.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/walojesokalidepasotibukaj.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/ihgqwhc/78891525157.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/7shg6hb/kung_fu_panda_toys_target.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_6000ad0da64bb.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/5364410.pdfIn PDF document text
    • https://kolukofutire.weebly.com/uploads/1/3/0/7/130740340/napevosex.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/how_to_thread_singer_201-2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_603df3bfd78a9.pdfIn PDF document text
    • http://bobejitamatu.iblogger.org/ligujewemepudixopazigot.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/58209112625.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/ahivZKX/dungeon_keeper_gold_pl_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5fef77c635760.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/858269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467032/normal_6052ae44caad2.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/gcSwjcL/luzivonenaginug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawenorite.rf.gd/breville_bov450xl_mini_smart_oven_best_buy.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/is_tp_link_good_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6df89ac-4561-4edb-8f22-e26c56e8a155/harry_potter_trivia_questions_difficult.pdfIn PDF document text
    • http://lebevinawefebo.rf.gd/buffalo_platform_sneakers_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e0956c-85de-4029-a940-2389e66fdb0d/rascal_388_mobility_scooter_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4da3964-0d49-4ddc-a9f8-90cfd9582df7/what_is_character_in_the_bible.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/jlpt_n5_chokai_with_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 5468 bytes
SHA-256: f9dad67287447d986315bb8768af50e89d10fe4e274a725df497f193366c3582
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 11108 bytes
SHA-256: 2356c9b663f2fa2d5791bbfa25de59d219ed5feebbc91dc456dfe4f2a24acc1c

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