Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4bbbf219df2a37…

MALICIOUS

PDF

80.3 KB Created: 2021-03-16 04:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 68b2b78521e6f3cb2c62197f97240e81 SHA-1: 94b159b92fab4a0fdd028c0efd33d86ba298bc4a SHA-256: de4bbbf219df2a37e551b63003b6aa52f9772c077643680fb1b2a397bff65807
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 0.9996

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://zajinet.ru/strik?utm_term=yard+machines+lawn+mower+engine+oil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5fe7418932b8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_600fa3745c1d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_6031d24b4017d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450628/normal_5ffe56ce68361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_601caa7261f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_601f7c1de760a.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/32522217000.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/5th_grade_math_minutes_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369160/normal_5fe49afe53689.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/best_free_readers_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fddb754ee42c.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/096ef10c-d6a5-4f32-9df9-01555075fbe5/jipirenimopepevezogej.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/54360240594.pdfIn PDF document text
    • http://gezixus.myartsonline.com/ritofowexexozujibinixe.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/kakalu.pdfIn PDF document text
    • http://pagosunizuboroz.epizy.com/menateviwokepof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48246bc2-8300-45d7-867c-fa31c252ef79/zamawotakelumatajanizijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3249d9f6-9da0-4bb5-b801-30d35e6b4f2e/2437325881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/620e9e6e-0b65-4e05-b798-7ed766e32486/2009_ashrae_handbook_fundamentals.pdfIn PDF document text
    • http://xojesenokok.epizy.com/android_tv_launcher_apk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/96073250296.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_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 5408 bytes
SHA-256: e717fd4260293670782a47c29ca8c89ef10bbd4a85487dfb5e94434ae12dff6e
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 11080 bytes
SHA-256: 0b8f45e7cf418fcddbd5e98affea9127ee49bd010db64379b2fe1d604dbf735f

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