Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ce5446c36bd692…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 22:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7da20cd722a0f3652f14f00b85020ded SHA-1: d108c215f8e8c7925fd68a6dde12b963e694aac3 SHA-256: e9ce5446c36bd692962802167c0c8c9fda6106f15562a29abba7421d40e3f22b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm. The PDF contains numerous embedded URLs pointing to other PDF files, suggesting a distribution or SEO manipulation scheme. While no scripts were directly extracted, the nature of the embedded URLs and the 'link farm' heuristic suggest an attempt to direct users to potentially malicious content, possibly as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://marchmont.ru/imgs/file/duzoroxu.pdf In PDF document text
    • http://gamebonda.com/ckupload/files/musalotonumutiponopunerob.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/23565881233.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/81180828335.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/reminijukelepifunus.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/96574416205.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/xefozamolozivopib.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/43450577141.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/79498925788.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/70478341403.pdfIn PDF document text
    • http://ombs.ru/uploads/files/nowovikadanolaxabota.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/59958061017.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/50004008026.pdfIn PDF document text
    • https://defi128.com/userfiles/files/5758247734.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/fotiritulidizuvumifonovi.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/webopozexaw.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/bajazokurukupedutak.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/vifozexofaza.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/ruleg.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133887548c3f---64692897699.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/99697148664.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/77prt2hlc4d5h0hh88v99htcv1/gitosivakexexoj.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022018.pdfIn PDF document text
    • http://jar-ted.pl/file/gowabafopug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=movie+downloader+mod+apkPDF link annotation
    • 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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 17924 bytes
SHA-256: 3450eb27d2361507a2e61c06625037b97c44d816c7644b88048428a32999add6
font_01_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 10524 bytes
SHA-256: c90b888a1a883f23a871233deec9ba8b5ea169ec007b177631faef07d58f1990
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1