Malicious PDF — malware analysis report

Static analysis result for SHA-256 6726e974ac7c698e…

MALICIOUS

PDF

82.4 KB Created: 2021-05-15 21:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 384a326eba5b5108bb528da9d019af7c SHA-1: 3353d521540216fa39a2516737dd7161fee4dcbe SHA-256: 6726e974ac7c698e09b567e4e8498f35c8192b96cc66d8e98f03ee809d44e400
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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-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://pelibifir.ru/strik?utm_term=altec+lansing+super+life+jacket+pairing
    • http://uber-global.com/eclipse_java_swing_designerz4596.pdf
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/mobolaj_nugasigige.pdf
    • https://cdn.sqhk.co/xubupigegi/erV42ib/52329744594.pdf
    • http://xumugawejal.scienceontheweb.net/62978489608.pdf
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/towowub-mujimumemagawed.pdf
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/vomofonoviz.pdf
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/9045a.pdf
    • https://nojoxarojip.weebly.com/uploads/1/3/0/8/130813855/5687787.pdf
    • https://kukixagunobi.weebly.com/uploads/1/3/5/3/135325453/zamekedeji.pdf
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdf
    • https://cdn.sqhk.co/gizapakoni/pjhgigj/equations_of_motion_problems_and_solutions.pdf
    • http://pshcomonhere.xyz/dungeons_and_dragons_movie_2022_trailerqp6y8.pdf
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/xokubasab.pdf
    • http://copyright-infringement.business/pozuwbkkom.pdf
    • https://vovaderinikuxu.weebly.com/uploads/1/3/4/5/134528816/fagexavop.pdf
    • https://cdn.sqhk.co/tibidimewako/Age7Nji/playstation_2_apk_app_download.pdf
    • http://janurikemodowu.iblogger.org/how_to_share_from_a_facebook_group.pdf
    • http://pevazaw.mypressonline.com/aashto_geometric_design_of_highways_and_streets_2020.pdf
    • https://xevaxeleputoli.weebly.com/uploads/1/3/0/7/130775823/9b9d6bfa.pdf
    • https://cdn.sqhk.co/febapaji/jc0dBmJ/free_download_offline_3d_rpg_games_for_android.pdf
    • http://spainsale.pro/39345002367r35tr.pdf
    • http://tuimag.ru/how_to_practice_self_control_and_detachment5ghmr.pdf
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/penarilifapa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pikaderobiw.atwebpages.com/do_you_capitalize_mother_nature.pdf
    • http://gematufevisuw.rf.gd/vojisezubobukugunuwaxa.pdf
    • http://tameladizikep.atwebpages.com/4290512200.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_off00010104.bin
5d3a619b365152898c589ac291ef09a7e0ce1eb68c2b3167c8497543fba42174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 5312 bytes
font_01_sfnt_off00011334.bin
dec9c98b9f013c130da6d412e5a5459b6c0e55347adfdcec16480d3c985426ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 12072 bytes

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