Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8c028ba50f9196…

MALICIOUS

PDF

87.1 KB Created: 2021-03-06 19:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d62227f621033d29fe13c70343f8127b SHA-1: 91fc68c5704280457428c579f656fd779622e141 SHA-256: bc8c028ba50f91963526560ee65f601ac18361f7e9c845c405716d8edd181e01
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/123?utm_term=bugera+v22+head+specs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415080/normal_5fefe0d64a7f8.pdfIn PDF document text
    • http://raisinshub.pro/save_website_as_chromeui2lf.pdfIn PDF document text
    • http://proita.fun/xopopebuxojufodebivawosor72t0.pdfIn PDF document text
    • http://reduslim-buy.site/grade_1_activities_printablesc9xfr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5fe0f3b6de1ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_6029989482994.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/8212861.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/3b70e12b241c99.pdfIn PDF document text
    • https://guxovegetixewaz.weebly.com/uploads/1/3/2/3/132302910/7d097fc99527c3.pdfIn PDF document text
    • https://punekoba.weebly.com/uploads/1/3/4/6/134612552/5484097.pdfIn PDF document text
    • https://tokatukunopiso.weebly.com/uploads/1/3/4/3/134352811/8965634.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/vufejilal-gubezokafaguro-wizosirixukina-tojisebigasoziv.pdfIn PDF document text
    • https://gapeduruje.weebly.com/uploads/1/3/2/6/132681343/roxubotesi.pdfIn PDF document text
    • https://vojituletakez.weebly.com/uploads/1/3/0/8/130874409/novamimutom_zivokifasiw_lomojosasulatu.pdfIn PDF document text
    • http://fastdonwload.space/3438115095791i0v.pdfIn PDF document text
    • http://uanews.website/letibumuxetilepoduvyb.pdfIn PDF document text
    • https://fojokelimavame.weebly.com/uploads/1/3/4/7/134713907/nofiporipedifukakof.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/d1827d04-b802-408d-a87a-b4d2b1002199/game_design_workshop_4th.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a308d5-6994-4579-80ab-7c2867e4f2bd/are_ilive_wireless_earbuds_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf84a88e-1b3e-44fc-8696-a5d0caa29c0f/paxisemifelefejam.pdfIn PDF document text
    • http://nebakeditawow.epizy.com/tupulupoxifoxivugenafe.pdfIn PDF document text
    • http://vipuwizu.epizy.com/dance_monkey_song_free.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_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 5544 bytes
SHA-256: 35795f5ff8008768a38ad4e17405cc34fa5fcf7e4984ea367ec6a8a7cc6be728
font_01_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 10664 bytes
SHA-256: e3fb4321654575e4844174ec1749d8d16c647332f3f34cf922a7fdcf74cb95e4

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