Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f166aa9321e7b96…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 18:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: f655f6d3b3852b4cbe8e370b8b861a2c SHA-1: 38c71aed7b8374cbf324b9ee7f27007f442dc76f SHA-256: 2f166aa9321e7b969677431e3b3b500f25fce8925249f0df9a755b36fb552a52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vasodoxegilufis.pdf In PDF document text
    • http://leebyunghun.kr/new/upload/board/files/72428403361.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/14396270685.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/9179631030.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/zerugitijoku.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/vatodufepusenexib.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/widisezunijoraxejod.pdfIn PDF document text
    • http://matras-devison.com/upload/file/33779449566.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/derozafeteribudowejoloz.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/kejosurozatekiwoso.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/kikuxabibozukokefiguxa.pdfIn PDF document text
    • http://sinoorchids.com/image/file/zokek.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/zovewenorega.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/vafojuj.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/13189022594.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/83666563680.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-03-06-55-01-31.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/rajijadelofamifozosu.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/wilasuxaxupibekirijijoji.pdfIn PDF document text
    • https://cubic.is/userfiles/file/61009613832.pdfIn PDF document text
    • https://partnermind.cz/images/files/wibamirabowuzipaximebiduf.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/97822918622.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f705e9ecf5---8103265617.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/vomukadefujewel.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/rarijutekijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+know+unsent+message+in+messengerPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/fusavesovofowe.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_off0000bcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEF 16640 bytes
SHA-256: 0d9afdabd3183747fe28c7a6592a04c80a162b78a7687e49e9d5fed0001b5887
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 10676 bytes
SHA-256: 6259b4cf3f02942cf522925c1edde9500a53d9bfa25f431cb687bedad04f0ca1
font_02_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1