Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9afe5c8fd880f41…

MALICIOUS

PDF

88.8 KB Created: 2021-09-16 12:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63b1f59048275256f99ac6ce274f3860 SHA-1: 35cece392cf16772bd413e23e660da1482390e02 SHA-256: c9afe5c8fd880f41c9dffbc83f81306f2630ce79b2687f90532cb2dd7233f7e5
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=diskdigger+pro+mod+apk+2021 PDF link annotation
    • http://alanaf.ru/userfiles/files/kanaxelijilezetaj.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/kazawamezinarorobi.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/xobim.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/46740539883.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/9179583496.pdfIn PDF document text
    • http://prompol.com/media/file/37060455272.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/62320791408.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a4023f717---80006895540.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/7979124151.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/8799477962.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/lezedorugodoruxoxemevux.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/77526489222.pdfIn PDF document text
    • http://jucal.es/images/file/35088135276.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/58219024332.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/kilesulu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tljvcb4tfbrbml8e8bfnt3rsn7/96052318496.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/19694596406.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/nizukigo.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/kerijikemakulosozep.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/wiwejikexuk.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/6791675041.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/mumad.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/56271268123.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/96241815102.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/gerekelowarijimalopifom.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/64230158532.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_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 10872 bytes
SHA-256: 22db6f5c2afec5369d06537e73b728756ebeefd8c7ec6c880e8b0678956746b3
font_01_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 21680 bytes
SHA-256: a6dfee60e0ef4d4da3900247f34e5c8988012381cd7c0df26f11c683874032c3
font_02_sfnt_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1