Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f845e8fe88a10ab…

MALICIOUS

PDF

73.7 KB Created: 2021-03-22 04:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eb591b9ac0b3bf3894e6f29ed3aa5e2b SHA-1: 9164869d3d2f6339ee734c9868b1b69535665181 SHA-256: 5f845e8fe88a10aba82f276d932b1ed30deeb82eb4670db3b8d8c30671ee1cc3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users via malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xezojetit.ru/strik?utm_term=what+is+the+health+and+safety+executive+%2528hse%2529 PDF link annotation
    • http://pilinopumewaza.mywebcommunity.org/risc_pipeline_in_computer_architecture.pdfIn PDF document text
    • http://greatholl.com/hammerwatch_planks_guidet9557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5fef5252298cc.pdfIn PDF document text
    • http://narixuz.mypressonline.com/23771077715.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/94369392320.pdfIn PDF document text
    • https://cdn.sqhk.co/fekurisakez/igxK5id/super_pinball_master_legit_or_not.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/uhbFvN6/xotikofomatekilaximep.pdfIn PDF document text
    • http://alcexpress1.xyz/infosys_verbal_reasoning_questions_with_answersb6hui.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_6010af063361a.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/the_sparrow_book_ending.pdfIn PDF document text
    • http://reduslim-siteofficial.site/tuberculosis_deaths_in_usst7x6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/hangout_extension_for_chrome.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_165c7b16c2b74a9aa1c9255edde06410.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_0c70b2aa9e25475f9701486b0da927e9.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_cb2431c132484a618ecf523580d99a48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/how_to_tighten_a_mower_deck_belt.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/beano_comics_free.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/kebaxedawakofinowepedaras.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_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 5412 bytes
SHA-256: 90123fa96fc8cb0318f79b36c45ddcd3486473ec328eba04828fc03b62faae79
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 11072 bytes
SHA-256: c30baddfc50684589469633a61f0ff9ddb4bb1fc2f85d1f87d4494bc1f1b8066

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