Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42c2cfad9f71efa…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 16:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8f2edbf4ed18629f3ef40c34a8bfcc05 SHA-1: 9fb6a86500a8c9a3a4f0e9cf812d6aaead782bdd SHA-256: f42c2cfad9f71efa50354c46958974f831a4e7a1e0ca6d5edab4a2e7a8330039
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=trimble+gps+pathfinder+office+manual PDF link annotation
    • https://ymy-tea.tw/upload/files/6362272665.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/mivar.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/42368498371.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/30342536570.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/tosewixibusonetag.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/mizivubufipar.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/59200408516.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fuxudilewuxedisetagew.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/34035027598.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/xusug.pdfIn PDF document text
    • http://ashioke.com/images/library/File/lavuvenosedegubu.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/raxomitefuropataje.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/tadavulatajolosanexar.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/futarusasunitoravade.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/xosaxetuxar.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/49106616053.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/visisudagasafi.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18612605620.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/87bd4b08a033f4a22ed9c72f94a9b65d/73905131586.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/gawaratamunekeluku.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/mumefujuxefewojo.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210902143527.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/bizoguf.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/36891262908.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_off0000c117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 17016 bytes
SHA-256: 43a5e2bb32e1329948bf78fba4539dc06fc93dfe36e40b2aa5f1e9da9ea4ce4a
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 11268 bytes
SHA-256: 3a57b5c588ae5da4566dc21e4c822ae690c302f2e7c816bf265ccd63cc910aff

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