Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a45b701de1f6ae…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 04:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 250e507b0670033b6b2b4fffb3283062 SHA-1: 5d1c7ef8c3c5f70521c8e428b229d9d512785d67 SHA-256: 81a45b701de1f6ae225772dd5c8281f9b281ce6df66b4a5072b9ffa5b69cc065
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=best+slow+motion+video+app+for+android PDF link annotation
    • http://ngocvietbungalow.com/upload/files/40934154898.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/nobubidewisuw.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/74213222499.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/janizenudotuvopuz.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/20267262148.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/576686449.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/benowizugarixakaja.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a7848d8ce72ad92c4b4851b1c3578ffb/89928455292.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/17193565551.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/21611067819.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/lilawugazajokodopuw.pdfIn PDF document text
    • http://bankerz.in/qpic/files/77886741463.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/625651387.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/14321410568.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/lonovugalo.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/87317030128.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/vodiwisalamojukas.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/80233176239.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/bufapozivufunonozij.pdfIn PDF document text
    • http://metallpress.ru/files/fejexaj.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210905164741.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8bqk7c4fb0n9n5ups32qcabao6/36176985576.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0B 16924 bytes
SHA-256: a7db809041d4fc721232afb30e32f81d8c88225b13e9a70d14bd69badcba37f2
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 10864 bytes
SHA-256: de7a708d856bd7b175e7a286fa2b381deeed42dbfd7f0751b56f73cabb177564

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