Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04d97aa8f9a218e…

MALICIOUS

PDF

80.0 KB Created: 2021-03-24 15:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f17bb76c4e69593e7cd8eafccbaa7be SHA-1: 8e01b0101e91cbf8f97bbde040fe23ea986fd2e5 SHA-256: e04d97aa8f9a218e6a971341889894dae4313b42cc92cee77487e11a67a0caeb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm configuration. The document body, though heavily obfuscated, contains text related to a 'South African Burger King menu' and 'wkhtmltopdf', suggesting a lure to disguise malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=south+african+burger+king+menu
    • https://zubenori.weebly.com/uploads/1/3/5/3/135394140/manodi-tufetunat.pdf
    • http://lynciguest.com/maserati_granturismo_mc_stradale_coupepf1rz.pdf
    • http://kindraretterath.com/wovikamenezaluki87sj.pdf
    • http://chebsvet.ru/what_is_pr_campaignsdkizz.pdf
    • http://igcopyrightclient.com/replacement_power_supply_q_see_dvr3tt09.pdf
    • http://lorenbayi.com/pusapozedusaxnuotv.pdf
    • http://esclub.pro/hp_officejet_pro_8600_turn_off_double_sided_printinga3jwv.pdf
    • http://pycnidwzxc.info/zadufavazatirujakunetuf8fpgr.pdf
    • http://sbrf.link/pawifoxawebegik5xe1q.pdf
    • https://tesebajaja.weebly.com/uploads/1/3/4/4/134402558/nigofefivenabuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a8360b53-7367-48b7-9446-1de2507af420/how_to_install_genie_garage_door_sensors.pdf
    • https://s3.amazonaws.com/vutame/high_graphics_android_games_2018_free.pdf
    • https://s3.amazonaws.com/ragejufa/zikixijes.pdf
    • https://s3.amazonaws.com/wixanarer/piriformis_syndrome_prolonged_sitting.pdf
    • http://vujesidewu.rf.gd/joraxerib.pdf
    • https://uploads.strikinglycdn.com/files/5c8f9d7d-b000-40e3-8d2c-7ec681280d66/lozulegi.pdf
    • https://uploads.strikinglycdn.com/files/bfecd8a4-c6d6-4f70-bf01-f38e57d06d1b/76938228087.pdf
    • https://uploads.strikinglycdn.com/files/d59699fa-3423-48d9-b567-1e7c6c3a7bd4/godfather_death_moral.pdf
    • http://xiwinuxad.rf.gd/bopesorogefogu.pdf
    • http://vujewim.epizy.com/clinical_trials_phase_4.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_off0000f5e5.bin
acc20d6094483f6cd9a7d2daccc543759decae389804da318da96ae97c25f911		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 5392 bytes
font_01_sfnt_off00010821.bin
0235e0462ddcc4eb3afc6a89efaa6d2a61f71b1109a4ec1dbd936f0da099c93b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 12840 bytes

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