Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f5fbb30e8ec909…

MALICIOUS

PDF

79.0 KB Created: 2021-03-17 03:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 616f8331f834a158ccf4aa3e18ab1abd SHA-1: 189d828bd1c237666216a40b35c9552c2608b44e SHA-256: f9f5fbb30e8ec909df066a9bc15c509fb0a0b9b77766df0b4cdd04c903f60d78
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 0.9998

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://crophysi.ru/strik?utm_term=arthur+miller+all+my+sons+film PDF link annotation
    • http://kafixerutatad.iblogger.org/wupofovixidejage.pdfIn PDF document text
    • http://libertinemodels.com/78648788862xd7c3.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/65386444629.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/chennai_central_to_arakkonam_local_train_timings.pdfIn PDF document text
    • http://sallehq.xyz/80608803144f5902.pdfIn PDF document text
    • http://manovina.mypressonline.com/pigugixiwerakawip.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/64916483731.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/lapuvojuleb.pdfIn PDF document text
    • http://sawawobutexukut.iblogger.org/bexar_county_court_divorce_forms.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/94ded4ec-3dd6-41f6-8bc6-4951d7679c55/netetot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7843021b-c572-431f-871c-bcc2552ea473/39770078473.pdfIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_f8adb3af53914c6c97671ea387b712d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaabbf51-c438-466c-8743-b3122d97b2da/lifubegoputemun.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_d640e088a7ea40f4aa658de3a6435107.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc967f0-f7c8-4214-816a-4ba5d878794b/how_to_install_windows_step_by_step.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_948cd91ec21a4df6bdf6cc838c84dd6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8eec01d-65e5-4ca5-9efc-d44e4bd63c11/small_engine_repair_training_michigan.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_7783d5b00586403ea2e297022b1a7666.pdf?index=trueIn 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_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 5100 bytes
SHA-256: 06efc044b7259cdbc1569910a7b3a8351b557b93ab03c7776ee571f12717a82e
font_01_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 11064 bytes
SHA-256: adc27fc42e4935f6f24d745be5dd7f700028b1556b10e621c2ecd93dd5b3c5c8

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