Malicious PDF — malware analysis report

Static analysis result for SHA-256 6151ba5823fa0ed1…

MALICIOUS

PDF

100.3 KB Created: 2021-05-31 18:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cf885d28c95aea1b76874dd4f241bdfb SHA-1: 9260ee2d778607824ecc93a07c8da973d5106b6d SHA-256: 6151ba5823fa0ed1636041b1fb278c3aa8128f27f53e0046d46b9fb10fc7441b
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://philabc.ru/pbw?utm_term=do+blue+dye+tests+always+have+a+faint+line PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4493195/normal_60b43997a1f1a.pdfIn PDF document text
    • https://nowezafe.weebly.com/uploads/1/3/4/6/134616333/benududutitegunaxesu.pdfIn PDF document text
    • https://pofumojonoro.weebly.com/uploads/1/3/4/4/134474045/8797212.pdfIn PDF document text
    • https://kepinofex.weebly.com/uploads/1/3/4/0/134017679/fd7daae7273e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378852/normal_5fdecc9d03981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_6043e2bed3da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_600bab88a550d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_5fd7cc1ee4f0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_600a8b268e1e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_5ff5740f90a75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b1c29201-7749-4b7b-bdd7-ce31eeac4276/linking_verb_games_for_grade_2.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144418797/mejimuxegebor.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144411678/survivor_39_episode_1_watch_online.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/atividades_de_portugues_6_ano_silaba_tonica_com_gabarito.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144411720/jiboxipaluvepafanuripog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/747d6977-2a1c-4f2d-82d7-38e2aafcb604/povivuputekorane.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144414363/samuberu.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/hyster_forklift_fault_code_168-4.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/67622378494.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA8 5172 bytes
SHA-256: c537d030d89e280f4e1e316eace06d77edf75bd2f6a17d8ce76a6595f83de8ae
font_01_sfnt_off00014e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E54 11620 bytes
SHA-256: f3f55f9bc128abf10b724af7383400592b1431c5d7436d4049d2c6a511db4fa7
font_02_sfnt_off000175b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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