Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca07d457898e209…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 19:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 834b4cc64f2969161d5c7770b8be08e9 SHA-1: aeef8922d5506de51b901a74b2fa001fe4bc9f19 SHA-256: 9ca07d457898e209d9ed626423578f137e060c86ca8dc74de9010fcf0628617e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The primary URL observed is https://zajinet.ru/strik?utm_term=washington+state+football+2020+commits, which likely redirects to a malicious payload or phishing page. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/strik?utm_term=washington+state+football+2020+commits PDF link annotation
    • https://wezifujizofuji.weebly.com/uploads/1/3/4/9/134904593/sirizawanetituw.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/jhfKgjg/edict_crossword_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/uuhj868/minewukunufutojupoga.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/luvavufuzaj_titemifalukow_wamifixitabi_fedewujobid.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/xijufavugewofunixabogojox.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/PSiziaw/finij.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/0zIQUjc/real_bike_racing_download_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokiwil/jyls7bt/mitima.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/ihjiT3X/plenty_of_fish_free_dating_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/QhidhjF/24064272935.pdfIn PDF document text
    • https://bupimapigi.weebly.com/uploads/1/3/1/3/131383283/67afc4cd5b925.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/lmia7ia/formula_1_austria_2019_results.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jagomizaf.atwebpages.com/73809746082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c02eee-0828-47f2-b995-88fd0b04b9ef/56902138814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da17f9f8-be9c-48bd-91f4-7364d59af959/fisaniwikopukarisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2274d7-a2d1-4e5c-b810-1a5d6665e312/xusajugezoxatimageji.pdfIn PDF document text
    • http://segimoto.myartsonline.com/pogozegefegekinopu.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/85270235622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268fc595-7b32-4a26-8b6a-86e18bf64188/can_you_buy_bass_pro_shop_gift_cards_at_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1b284e-3312-4b27-b805-dee3b1428eaf/excel_vba_method_range_of_object__global_failed_named_range.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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 5624 bytes
SHA-256: 278f24a50356bd85a640a234a13f93c7b3383dc90cff1be874199321ab58de6a
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 11048 bytes
SHA-256: 6220ec9d5a4b7a3937f79e20d1b9654cc9f161556bcbac97e33760c9df8ff6fe