Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f433e11d435d904…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 17:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b0b7c7d00dfe0e36a41ed3b2704ff7e2 SHA-1: f12dfc8d22dfd91099db6d0f3239f3d722b42d00 SHA-256: 4f433e11d435d904dd5a07caf6c97bb9c43e91958f5a04f1c967fcc5252c1b6e
166 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a lure for a worksheet answer key. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a secondary payload via the linked URLs.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dugedepap.ru/strik?utm_term=the+russian+revolution+of+1917+worksheet+answers PDF link annotation
    • https://dudisavaw.weebly.com/uploads/1/3/1/3/131380109/sejuviguwum-nugobetif.pdfIn PDF document text
    • https://cdn.sqhk.co/bubarozotuj/0Aq7ihN/79211254113.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/7gchjic/42609363354.pdfIn PDF document text
    • https://cdn.sqhk.co/nizaveni/0ibjfKj/best_anatomy_and_physiology_app_for_android.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/9842201.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulirogikek.epizy.com/berger_paint_dealers_price_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff48f3b-dadb-4aef-a883-39933a63ef4d/30723303353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ffae37-867b-4029-bf77-7d4f17eee2a3/volkswagen_auto_repair_shop_near_me.pdfIn PDF document text
    • http://lotawovuvowuk.rf.gd/casio_protrek_tough_solar_manual.pdfIn PDF document text
    • http://jaxojuru.rf.gd/washing_machine_replacement_parts_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc2353d-c08f-441e-b763-19747c9cb03f/cobra_29_lx_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/22_clues_level_21.pdfIn PDF document text
    • http://bekokapag.rf.gd/what_did_time_capsule_mean.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_8c7888cedd044714b960ad4f86ac0165.pdf?index=trueIn PDF document text
    • http://metivatozu.epizy.com/xaxedesasadodelodeko.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_45cb1bfda5cc439388b6c81ceec991b3.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_6ca998ddc1a644b68af8737f5c370747.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/difference_between_bar_graph_and_histogram.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_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 5308 bytes
SHA-256: bbf13f05d4e60c69ba42c8b7a068eca7fd198bbb76c84c21c7ffbad01ddef722
font_01_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 10864 bytes
SHA-256: 01af4698b9df49635904de08f08b11693f20a17d42ea8df615d2ec9570be4534

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