Malicious PDF — malware analysis report

Static analysis result for SHA-256 744f675db7083860…

MALICIOUS

PDF

78.6 KB Created: 2021-10-10 01:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 010a45371323f9c0768302df2e35793d SHA-1: 04a8b3e4aaa629eacf082fa03fdb53c6ea8fe580 SHA-256: 744f675db70838606274de2c7e7c0de52d784408f822f910d9c96fd8a8a2078d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://escolaalfa.com/userfiles/file/50292541415.pdf In PDF document text
    • http://centrons.com/uploaded/file/1360247255616099500a682.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/80280249007.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/roverujofibojiketoz.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/10956689193.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/pinim.pdfIn PDF document text
    • http://spharma.ua/files/file/ketix.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/pevijozelife.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/77117262091.pdfIn PDF document text
    • http://ridendo.cz/files/file/12778469922.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/buxupakutobaxuluvetavote.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/58109288563.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/nivibepadifafinok.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/merobufazaxugoposapepivi.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/gosafudapadibafipifejim.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/kedozivonikavawof.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/getevulupazotepibewa.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6bb023ac5eb3c905e11b99962d14afeb/45414203887.pdfIn PDF document text
    • http://k1a.ru/images/files/file/33708401807.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/nojelutij.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/36282744050.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20211005183633.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/98223581813.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/32914727843.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jln5477v34oemld45mge6p0q5s/37687568524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=happymod+fast+downloadPDF link annotation
    • 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_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 10524 bytes
SHA-256: 330221845e94f891c903a170ce4a99b8fbf241ee295ef6100ead02b03d63ef3c
font_01_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 18116 bytes
SHA-256: 4d367b9e0f15c780b09deb0085d85eb775609346717752eef87e1243b8758e55
font_02_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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