Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c0ea0feed95158…

MALICIOUS

PDF

68.2 KB Created: 2021-03-16 09:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9be809fdeb8c47c2d9e43d3c01078b09 SHA-1: 14ac61eb2c9e169856d1752bcabff0dd819dc974 SHA-256: b6c0ea0feed95158b400abc273e1d06324b7f4e697243076695f86a4c3b6b301
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-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://soxebez.ru/strik?utm_term=bluebook+short+cite+books PDF link annotation
    • https://cdn.sqhk.co/ketejeti/egexCge/dividing_monomials_practice_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_603bd99759c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fd989184b99d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_6039fbe2696bb.pdfIn PDF document text
    • http://zekifafeter.scienceontheweb.net/wukubisefak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418972/normal_6007bdbee4da4.pdfIn PDF document text
    • https://cdn.sqhk.co/galuladoxaka/dhb8wqI/download_mod_slenderman_minecraft_1._7._10.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/kovixemoguraziwexap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449405/normal_5fd35744ed405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_c5d2737c104a4b07856e904a7cdfdac3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/siber.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/78376050377.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_d1f328698a984e6e9b8fdace7e812793.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/skyrim_xbox_one_mod_load_order_help.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/50480500649.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/44844410708.pdfIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_5c20bc96674c4154a468ac0c98261db8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/39065551239.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_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 4928 bytes
SHA-256: 38c4780188aa68ccb14d174b81622838db34624ca60e411517ece87b7b006f96
font_01_sfnt_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 10460 bytes
SHA-256: b3b23c70e250fb48412c0129e354f4a75301b26bc0eb7f848ff5041b61ba1b9e

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