Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b6b93a8a2bb2bf…

MALICIOUS

PDF

74.7 KB Created: 2021-03-08 16:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b810da2b6e07672771083c98e412791f SHA-1: 20bae5a7522b93f6fb9423fb301f70c21158f535 SHA-256: e9b6b93a8a2bb2bf3144e9bb84b9eafffca53fcbb48f79a58543aae6bb7f90b2
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://druttle.ru/strik?utm_term=fda+guidelines+for+quality+management+system PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489615/normal_600dd66556e8f.pdfIn PDF document text
    • http://vedoluzomo.iblogger.org/koxetulodifodatelakite.pdfIn PDF document text
    • https://cdn.sqhk.co/xivudebisov/hfibgjz/pelikuwadimubugipon.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekasip/jfRooXV/40675575552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_6020727fe1ed0.pdfIn PDF document text
    • https://kowevufewes.weebly.com/uploads/1/3/4/3/134388306/97ceaf44e4c8434.pdfIn PDF document text
    • http://gusanod.22web.org/why_is_my_mouse_scroll_wheel_not_working.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/4411da4b49ee.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/geihriv/9425412003.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/62619623116.pdfIn PDF document text
    • https://cdn.sqhk.co/gifalaminika/jkgdhgz/81033129351.pdfIn PDF document text
    • https://xokaxopo.weebly.com/uploads/1/3/2/3/132302824/pamuvuberijel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawusizajuxo.epizy.com/conditional_statements_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b5106c-6944-40a6-891e-c3a7ac329ea7/god_is_not_one_stephen_prothero_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3068e30-0025-4b3a-8d61-2011a0d4e73c/lozurubokukejukabofemimi.pdfIn PDF document text
    • http://jilovimox.rf.gd/91087918497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc9ebf5-af3a-4905-ad4e-7fb4a6e7b0ef/89133721392.pdfIn PDF document text
    • http://pefegazafil.epizy.com/84309552562.pdfIn PDF document text
    • http://fapabuzoliwesaz.epizy.com/fitom.pdfIn PDF document text
    • http://remivipe.rf.gd/i_spy_free_printable_worksheets.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
stream_002_off0000e910.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE910 5412 bytes
SHA-256: d19c47a07bc511b8aca7d9464ec6e63396e7ec1799e5429b751d1f265aa5a834
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 9976 bytes
SHA-256: f2b55d0377b2355b8cd17e98df3966442152e55b43efa29361e6dfcd501b6690

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