Malicious PDF — malware analysis report

Static analysis result for SHA-256 107cdb7a7192292d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 06:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dfe853da1b0ee18549026a6e5e4c1b8 SHA-1: 3c19d90e60cdcf5a487239b218e146e833212077 SHA-256: 107cdb7a7192292d579d6e19f28e75722f5493d74f4c529e0059e37253485483
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://thefarmatarapahoecounty.com/userimages/18944124436.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/clmq149chuml4905k52p4ggv90/musoxufa.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/gufojajilabisakomolu.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/89203040481.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/marizi.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/natifetoro.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/53323258656.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/16682269795.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/94179926449.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/zuxoraribawuf.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/23340799781.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/xajebanofofo.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/39226379784.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/xisevojirinog.pdfIn PDF document text
    • https://fond.ru/userfiles/file/77440550846.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/2296040950.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/78345646922.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kurefuvabobir.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/14706622536.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/50128064866.pdfIn PDF document text
    • http://chineseclothingonline.net/File/25441986269.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/dudiwigufuxiwokak.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/17661624888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bluetooth+gamepad+for+android+tv+appPDF 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_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 10996 bytes
SHA-256: 2af80764f9da27c629d8546953196074c7b90235edce0b932214d756b88c4feb
font_01_sfnt_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 16308 bytes
SHA-256: c0c8fe058e4f79e829e663e8cd83a093bb5684d60f39b0f78d4655ed816d4d9c
font_02_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1