Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11fc8cabdc5bee6…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 04:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ea552f8542d4ec6e8c0a0b19e00fa0c SHA-1: 7b33718887f046c7405ff0be8331b74826194cba SHA-256: e11fc8cabdc5bee636d060404a873e9232358c6c065d36835029e988217490db
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to domains associated with link farms or potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary external URI, 'https://ponafet.ru/award?keyword=mathematical+induction+problems+pdf', suggests a lure to a site that may host further malicious content or phishing attempts. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=mathematical+induction+problems+pdf
    • https://cdn.sqhk.co/xizubulizexe/dJTgjHA/dr_driving_apk_mod_ios.pdf
    • https://cdn.sqhk.co/lorotukogof/zibJ1hd/animal_jam_unblocked_hacked.pdf
    • https://cdn.sqhk.co/xarozowuzosa/LrFhgPI/wulopebagogafi.pdf
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/9c213fb83efe.pdf
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/ccb0e.pdf
    • https://cdn.sqhk.co/niririga/jg2qgoU/gun_sounds_effects_pack.pdf
    • https://cdn.sqhk.co/buvaboda/icMj0pR/ruzenuve.pdf
    • http://julivojurukumu.sportsontheweb.net/vishnu_sahasranama_list.pdf
    • https://cdn.sqhk.co/rizuwevize/ggK9lp1/laser_quest_modesto_california.pdf
    • http://lobabinuladeri.medianewsonline.com/64906471435.pdf
    • https://cdn.sqhk.co/gukovafax/kw6Torc/30513032994.pdf
    • https://zotepuzexalebox.weebly.com/uploads/1/3/5/3/135397030/nuvebesalizol_zalufevize.pdf
    • http://vadosixajobirug.mygamesonline.org/divezu.pdf
    • https://cdn.sqhk.co/tamejenonisi/cieicED/31443660159.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f29f189-4afd-41bb-a717-9637173bbdad/47846146996.pdf
    • https://uploads.strikinglycdn.com/files/77e96ffe-d784-4473-8ecc-87b9788e5379/wine_enthusiast_18-bottle_dual_zone_max_compressor_wine_cooler.pdf
    • https://uploads.strikinglycdn.com/files/56b4dbc0-67d2-49f1-bf77-10065259520f/faxakududikuja.pdf
    • https://uploads.strikinglycdn.com/files/252fce16-1179-464d-bb59-e71bb77cc5b7/the_man_in_the_high_castle_season_5_ending.pdf
    • https://uploads.strikinglycdn.com/files/fb9963ed-ba35-4914-9b01-06b632fc912d/texas_instruments_ti-84_plus_c_silver_edition_graphing_calculator.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_off0000f3f8.bin
24afc6c314ab922a987233fca48bb314d4cacc3995554cb742df187464d0556c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 5540 bytes
font_01_sfnt_off000106a6.bin
5db69ad66e4692b9c5311796b79798322e9100cdb1303d2703326915aaec57c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 10844 bytes

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