Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdcbbb8bfe9d988…

MALICIOUS

PDF

77.2 KB Created: 2021-04-26 08:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3111e662445852c383f614b71aaed361 SHA-1: c57aa5666687bb233a365d429c3cd1de12b9501c SHA-256: fcdcbbb8bfe9d988892e9d1d80781f40ec740af5e3275b32ba7e9f666c4c61e3
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that appears to be a lure, further supporting the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=the+attack+yasmina+khadra+analysis
    • http://top-salez.site/87943631445hxqtp.pdf
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/woguzisejedos.pdf
    • https://pudexaxetodeli.weebly.com/uploads/1/3/2/6/132683251/1963177.pdf
    • http://logvoz.ru/10999736436m8kv2.pdf
    • http://axecheat1.xyz/what_is_the_t-critical_value_two-tailed_and_what_does_it_tell_youj45yo.pdf
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5fd05fec47f62.pdf
    • https://cdn-cms.f-static.net/uploads/4468572/normal_603584b41cabf.pdf
    • http://cadenalia.com/kitchen_cabinets_plansrvdf0.pdf
    • http://artyom.guru/how_to_display_data_from_database_in_jsp_in_same_page4aunn.pdf
    • https://fofopozisiwel.weebly.com/uploads/1/3/2/6/132696178/zilabaditu-sepipekilojabig.pdf
    • http://pifovabu.getenjoyment.net/axones_mielinicos_y_amielinicos.pdf
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/381e90.pdf
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/2bd9cff635a50a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1fe74e36-3571-4e43-b96e-2bbd30e93474/44072976091.pdf
    • https://uploads.strikinglycdn.com/files/bf2f4152-06cd-4178-aecc-e6c1367d0a21/45226046087.pdf
    • https://uploads.strikinglycdn.com/files/47ba79be-5ec6-4c5b-9860-9fd0b47238cb/tixijoraruwigoxifobetuvi.pdf
    • http://gototura.myartsonline.com/what_do_you_wear_to_work_at_home_depot.pdf
    • http://metoxitaneg.epizy.com/autoimmune_lymphoproliferative_syndrome_alps.pdf
    • http://sajatuvireguta.atwebpages.com/misupufij.pdf
    • http://mevekanuz.epizy.com/baofeng_uv-5r_dual_band_two_way_radio_canada.pdf
    • https://uploads.strikinglycdn.com/files/77f9d0a7-4bff-4e65-9633-70e2c05c2fec/60347337556.pdf
    • https://uploads.strikinglycdn.com/files/f3819eb1-6e57-4eba-95ec-7f002203cd97/using_the_method_of_joints_only_determine_the_force_in_each_member_of_the_truss_shown.pdf
    • http://kopolug.myartsonline.com/28820684343.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_off0000f020.bin
ae2ec5ef9831695cc9f8efe0742f0d8b7537393049c22a1f49c03388957f7dc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 5296 bytes
font_01_sfnt_off000101fa.bin
f403af8ae905a4ba61cd0a7ebf58d9c183eeee67217e7a65ee341d56dfb81a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 11096 bytes

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