Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9641bd0038e0fd…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 11:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 262925ea0abdede6bb6663b4d14a2234 SHA-1: e1c2b63c8a9360bc31b43a630798e82acb89d06f SHA-256: de9641bd0038e0fdb7995b1f09b84df453b827e18f49bc9ea7418f6176af9a46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a likely attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=the+sims+castaway+cheats+pc PDF link annotation
    • http://gildiamasterov.ru/userfiles/file/66229147715.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/pisovulifinomubapitovatub.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/51978546158.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/dalerogavokefojivijugo.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/wivatemag.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d0d94ca5a905698ef32b785652be7f86/dopajawigezizedejidezuma.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/8103091273.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/80937697974.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/nosidukaji.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pivikabirudixitanapumu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t2c65u0upim7o5en8t97s00al9/jedudamawemobilub.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/92497284392.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/75163037834.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/kuzarulikozidawi.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/poputilalezafajiximosuxu.pdfIn PDF document text
    • http://badgerhillfarm.uk/39529820252.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/tibofi.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/rinosusaxuwinuniru.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/205428832.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/ripomatubovaj.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/saziwisejavixudifujok.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_off0000afe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE2 14928 bytes
SHA-256: ce8da2847abe0a269b597328136504855dbb281bb835abcf8473107ce41f9fb8
font_01_sfnt_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 10432 bytes
SHA-256: af4097c655f21fd6735a7a16e676e91d80f9e44559b765fb44432dae8a3e0623

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