Malicious PDF — malware analysis report

Static analysis result for SHA-256 615de965ba8af07d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-10 18:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4efb288c7e1220ec875369231630d999 SHA-1: c6675ae8e5a897c689cde10719f854189923c8d8 SHA-256: 615de965ba8af07d848d186089580f1d9655ae90e93cce78756b85fc0a9bb312
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are on disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination. No scripts were extracted, but the presence of external URIs points to the document's intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=cometh+the+hour+pdf+download PDF link annotation
    • http://mitsubishilongbien.vn/images/ckeditor/files/kupuvusabu.pdfIn PDF document text
    • http://metallpress.info/files/gapenimibuludusevam.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/werijanovugu.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219211144.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/najuxewaxizolasurofi.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/vukarapo.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/nokegiza.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/vitalefusoruj.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55525509404.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/rijulojezu.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/fewupoti.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/79810389079.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/21978992080.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/69900228742.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/30291805324.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/58101150902.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d4bf5f163b9ad8e3e63119b281822ed5/10240473983.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/11352089152.pdfIn PDF document text
    • http://kyea.org/imageuploads/wiwitulu.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/73587374862.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/30616862587.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/95293642248.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/muwodurojef.pdfIn PDF document text
    • http://dytac.hk/userfiles/jevigamupekutaxoxekiri.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/89248242971.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_off0000bbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFF 10720 bytes
SHA-256: 4e37a7057f761589d76f93bd909cf3dc64f50b597df2de1bb733605af2a8f45b
font_01_sfnt_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 17148 bytes
SHA-256: c8f108532ab1c413f3dea0215e80ce211dc1991bbb9a24e6355d8d2c00cd1eb5

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