Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8da590b50ce85a…

MALICIOUS

PDF

78.2 KB Created: 2021-04-04 13:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c7a01d4fec656f4a64ae8cfcbcd6c9b8 SHA-1: c7e16b27928244518e20133afb688be7369079a3 SHA-256: 4f8da590b50ce85aab891c6cb4dcc8204c906e64b8803894546fa4a47e67bf33
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=agatha+christie+films+wikipedia PDF link annotation
    • http://shopmzm.site/71547610436sv657.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/arbitrage_trading_strategy.pdfIn PDF document text
    • http://es50off.pro/how_to_maintain_a_monstera_plantw8noj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_5fd0bf05cd423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_603047b1cc88c.pdfIn PDF document text
    • http://swiss-gear.store/what_is_the_point_of_fahrenheit_451wsv7j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5fd6aaabb4d8f.pdfIn PDF document text
    • http://siankaanmexico.com/acero_inoxidable_definicion_y_tiposalu19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5ff6a1b7a001e.pdfIn PDF document text
    • http://zootime.store/classic_shell_scripting_githubmp5ue.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/effective_communication_in_business_ancient_heritage.pdfIn PDF document text
    • http://satanifefa.22web.org/bosamedubipofezigob.pdfIn PDF document text
    • http://top-odejda.com/how_to_study_for_my_real_estate_exam8vs1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_6011e055ced7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://parubixus.rf.gd/wixobepatunumonilojo.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/lebisageveneweso.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/brodersen_unic_xw_manual.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/uppababy_vista_2_stroller_sale.pdfIn PDF document text
    • http://rixogapokat.epizy.com/harlequins_40k_codex.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/cross_sectional_anatomy_brain.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/rodibilidekoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/89777762118.pdfIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/zuwiworovobizezutem.pdfIn PDF document text
    • http://ruvotavigep.rf.gd/51108454737.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_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 5712 bytes
SHA-256: f601c6ccb1d7b75fbdb076bf9554394d7dbbc48ae2d017dec384058520a8cb98
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 11284 bytes
SHA-256: 9e3af85c11dc5c020ee26bd0e46a0b3c178204de7e7c6d6cdaf4a8f065a375bd

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