Malicious PDF — malware analysis report

Static analysis result for SHA-256 f955488021dd86b9…

MALICIOUS

PDF

77.6 KB Created: 2021-03-21 03:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: db608d902c82cfac9fb01426abc1423d SHA-1: 843d748a4b76e6135bd1fe6b007cc18f76a048b2 SHA-256: f955488021dd86b98a1ab414f3593507d20da67c916f007b224fd7b97b817efb
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 0.9997

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://botokaw.ru/123?utm_term=descriptive+research+survey+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383131/normal_600a92b56c7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_6014bd08535eb.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/pcp_pneumonia_treatment_guidelines_idsavia8o.pdfIn PDF document text
    • http://kleomaften.online/dell_optiplex_gx620_pentium_4_ht_specsuh9my.pdfIn PDF document text
    • http://ionatr.space/34083492567qqpln.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5fd0996b6acd4.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/wexobolusafizoviz.pdfIn PDF document text
    • http://gobitujesan.scienceontheweb.net/52515079882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_601aa24387695.pdfIn PDF document text
    • http://pusovemolexed.scienceontheweb.net/dulirobuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://geforagegi.atwebpages.com/sandisk_wireless_flash_drive_software.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/vuluxobilanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68933d1a-0761-4008-b0d7-25951c1357cf/online_english_speaking_chat_app.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_c76e0b367b144a5d989bed65c4c9cc3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fdaedf3-ebe0-43fe-9f3f-5065a3975235/56124596358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6428f2-8d3c-4c96-bbc8-eddeda7e27fe/tavesa.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_81ac55a599e145e5953d4ed991774cd9.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_ca537484b6d548f4852e3c789b9b590a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf3ca4e-2109-49d8-b87c-567a72725aed/21718560588.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_133bdc056f1a4e95a16836e03cc9be3e.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5372 bytes
SHA-256: 4d26648359e9630659a872cae52edc011153980126f6737e4bede586dbcb9f6b
font_01_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 10644 bytes
SHA-256: caa0709d97b87eba46822bc8a9b6ca952a1c5f4043f495bf2c606c4f9a494d53

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