Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b932b96d1de96e…

MALICIOUS

PDF

74.8 KB Created: 2021-03-28 18:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 528f487bc5c9b974bdcfd129ebd88a12 SHA-1: 54a0aef560244851a34137025e2b0e1aa0943ba3 SHA-256: 86b932b96d1de96ef6bd6f73aae273453bb448cfc7b355f44bb8a0d86938ce3d
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 0.9993

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://kuzutuzo.ru/wix?keyword=best+cism+study+guide PDF link annotation
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/9412684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452599/normal_5feb0adb26e6e.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/how_to_use_hans_3ds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_601fa5a5f2bdf.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/94783288051.pdfIn PDF document text
    • https://degobevotu.weebly.com/uploads/1/3/4/3/134393677/3327093.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/3188387190.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/xizimidonupawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_6027bc2ddf047.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/3877024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepinud.rf.gd/36891602391.pdfIn PDF document text
    • http://zopijejezi.rf.gd/88898877435.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/zukubu.pdfIn PDF document text
    • http://xegilejefaga.epizy.com/shimano_alfine_8-speed_internal_gear_hub_with_gates_belt_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/vox_ac15_c1x_blue_alnico.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/american_gangster_movie_300mb.pdfIn PDF document text
    • http://senosepuduliz.epizy.com/simon_vs_the_homo_sapiens_agenda.pdfIn PDF document text
    • http://dumizalu.epizy.com/72060749921.pdfIn PDF document text
    • http://zavivemigowoson.epizy.com/buwatezired.pdfIn PDF document text
    • http://zutumifamele.rf.gd/54077916390.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/heerema_marine_contractors_annual_report.pdfIn PDF document text
    • http://nufurezoguboli.epizy.com/nenuvuwon.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/53977906387.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_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 5072 bytes
SHA-256: 429224ce5ab60f412422f1bd2403888f2b8861db2beea8b588f88decb6fbfc34
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 11436 bytes
SHA-256: 734e6f0393898fcbc15f4a0f2f8187e7b38b50f1df5eff3211e039d580c303f7

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