Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7aacf50243967f…

MALICIOUS

PDF

98.1 KB Created: 2021-09-18 21:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d11d52070aa5d309f4c373598595bc5 SHA-1: 1b3c541a8f3c7147076788373f1fd57fbb2dec68 SHA-256: 9c7aacf50243967fbc79ba17751122dccfb44e444f60af4e588aade06256db9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://allytemp.ru/uplcv?utm_term=android+programlama+i%C3%A7in+gerekli+programlar PDF link annotation
    • http://pmke.cz/pictures/files/88489470929.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/lekijoxes.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/16066127562.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/paninelubimanusejasakepuw.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/14435804778.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/17768994255.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/9704729247.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/jelilikatudokob.pdfIn PDF document text
    • https://satesayap.com/contents/files/wadotadalezu.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/39521574478.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/sesefabi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3efac744f0e84830cb8793dded1f1570/xukixuzal.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/78929278528.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/33784776475.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/30963417336.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/29095252174.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33198288519.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/58263384995.pdfIn PDF document text
    • http://theponghop.com/upload/files/79745293055.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/49620377345.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/21059601842.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/virugufapigaratuz.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/xulefekufojixob.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/lokage.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/29264569374.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/84918230045.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_off0001187e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 19168 bytes
SHA-256: c2737f5989d4f624a261f1ec69177173877c383b264182aafe161b59495a3784
font_01_sfnt_off00014775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14775 10740 bytes
SHA-256: 9abd8a6596ff68e763375fc420e700d196a0895525da068223e058831bf35904
font_02_sfnt_off00015fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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