Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f14f2625c248526…

MALICIOUS

PDF

73.2 KB Created: 2021-03-20 15:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9a985f49c1c458885caaf8043e1cbce1 SHA-1: 5c0ec97ae38e13dd6955d03b3c8743b734fb4f14 SHA-256: 6f14f2625c248526e7200e001443dcccff9824907c9085bbc12d49558887e656
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://botokaw.ru/123?utm_term=illinois+withholding+allowance+worksheet+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503279/normal_6031e861beff8.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/xololegujazil.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/c1925.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/breadboard_projects_for_beginners.pdfIn PDF document text
    • http://bupetud.xyz/niziluxomabutuy0z.pdfIn PDF document text
    • https://gebulofafilo.weebly.com/uploads/1/3/4/7/134717894/3751701.pdfIn PDF document text
    • http://topcreditcheck.info/percy_jackson_and_the_olympians_the_lightning_thief_movie_google_driveod358.pdfIn PDF document text
    • https://weduxuvup.weebly.com/uploads/1/3/4/3/134308116/defuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379615/normal_5fe2bd58238c8.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/83445822634.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/xujikopobidodiwibute.pdfIn PDF document text
    • http://free-at.pro/1._bowers_wilkins_formation_wedge5xlol.pdfIn PDF document text
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/8e86088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_60526bcb99d00.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/2fafe178-e846-4423-b225-b5be38acb5ec/laho_meaning_tagalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8b42c7-1d4c-48f4-958b-428a577588ce/finivurabasarasebor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab414f6-55ae-4080-9be3-516f8641fc05/bomepovapokigikapikulilip.pdfIn PDF document text
    • http://gofumakexoj.onlinewebshop.net/95492279880.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_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 5776 bytes
SHA-256: e35fed29c4190ea2551d8a1894ca86c240989554a6a527049dffa84da34d1a8d
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 10968 bytes
SHA-256: e62caa1030ba1fbe00a8d01f8dd3a71b1fd25b42183b76787402a13bee82ec72

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