Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89661a69c38579c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 06:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19483fac55f18b800fdc22c52d13fd00 SHA-1: 546e1b40d22c33b2f66ccd627b6287a5885ac8f6 SHA-256: a89661a69c38579cd12b8b55f05b432037c7ea4c7aed7985c5d5d7c99855bb0a
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting. The primary purpose appears to be directing users to potentially malicious websites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of many unknown-reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=oma+client+provisioning+pin PDF link annotation
    • http://quartierdete.fr/uploads/fckeditor/file/88860996481.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/posolifotuwaxazuvuwawek.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/vuzuzidilidepasezivelol.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/19304130666.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/fekaninilawodupefiradipet.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/56402506728.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/95265236502.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/19703346241.pdfIn PDF document text
    • http://protezas.lt/i/File/tupinusozududuwoputi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jenukesipabejebasipevujis.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/12902721819.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/12800182567.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/bemajiko.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/19196577175.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/dirogubunuw.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f33016160356a3b1d122f67fc33b8e49/ronefiridisufananu.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/vulugamuxu.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/92236788659.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/54638142815.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/78232891424.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/xozoruzimebobobunulorab.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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17872 bytes
SHA-256: 3164be6e188586f02bfd7cc8c42a8eb2a5d4eba871498f0d5f8e9d41759549d1
font_02_sfnt_off00011a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A71 10808 bytes
SHA-256: 184d6cf4f5246d55bb2d0239af1063e3496843616ebfa0427b869bc7bbacd7aa

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