Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b98cd4d54eecd5…

MALICIOUS

PDF

85.6 KB Created: 2021-04-15 23:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8a9aa7d41bc8d765e6cab4e8e92b6ec1 SHA-1: 233c0db94fff0dd02e319e8823f95bd8a1365086 SHA-256: 01b98cd4d54eecd5e65c987d9191c904a7f6e92244f9144890e03785d8d5b428
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, and one specifically links to 'midufefew.ru/strik' with a 'utm_term' parameter suggesting a phishing or redirection lure. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://midufefew.ru/strik?utm_term=list+of+text+structures PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460461/normal_60052ddf229c9.pdfIn PDF document text
    • http://ninefuva.22web.org/balance_druid_dps_guide_8._2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_6030faeaca5dc.pdfIn PDF document text
    • http://discount50.pro/paxekazoxixerepiky2u90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463034/normal_5ff1c41d54b0f.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/tiliranebakupuwazob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5ff6b7d261fa2.pdfIn PDF document text
    • http://good-production16.site/bicknell_family_performing_arts_centersshl0.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/kununa.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/learner_centered_approach_to_language_teaching.pdfIn PDF document text
    • http://bolipoloweda.mygamesonline.org/baldassare_castiglione_book_of_the_courtier.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a362138c-c2d8-420e-81fb-bf5bc0615f64/southwest_truck_insurance_agency_inc.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/simple_present_tense_exercises_perfect_english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/what_colour_is_your_parachute_audiobook.pdfIn PDF document text
    • http://buketoxepebaf.epizy.com/96237974277.pdfIn PDF document text
    • http://wabalegawamiraj.rf.gd/optiplex_7010_dt_video_card_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/brochure_creator_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/wendys_small_chili_nutrition_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065ea0e0-3275-4841-8ddf-e37ba18305ab/69820382054.pdfIn PDF document text
    • http://varewokumozikon.rf.gd/jotokona.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/zudunasunekisizoxogonodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62785b67-8b8e-4fc1-a8a1-faa75f338628/nelulazonosobamevevibev.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_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 4640 bytes
SHA-256: 33eafc6ed7a372eca9199fe18cf62f571f2518d88e7925ea776bebd6b4e9440d
font_01_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 11164 bytes
SHA-256: 62d4c93dcd4bd0bfce623f7dfecc4baf18c07b6db88ae73e49af147a95c9a312

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