Malicious PDF — malware analysis report

Static analysis result for SHA-256 547d01335931bfb8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 02:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d164fa0d00d4f5d0f8f5dad6adc1b3bc SHA-1: 48aafaad678b59df36da4a83401df95d7ceec77f SHA-256: 547d01335931bfb8a4f04e45d75230ef6e9ee7d8baf0b820ccde93771f0e67b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs and is described as a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest this document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=langston+hughes+theme+for+english+b+meaning
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/59443453596.pdf
    • https://wildnaturetravel.com/File/89827811670.pdf
    • http://matrixpaint.com/ckfinder/userfiles/files/92471190392.pdf
    • https://concertwristband.com/resimler/files/zagawukosisizerika.pdf
    • https://acconpriti.com/ckfinder/userfiles/files/dugexovozoza.pdf
    • http://htwy.com/upload/file/tavutu.pdf
    • http://dellalontra.it/userfiles/files/98776288292.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/finokugirovesugapezozomux.pdf
    • http://coachhouse.info/assets/file/62404730192.pdf
    • https://jerseyshorepirates.com/userfiles/files/luvirozagakajiwunotud.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/vewifasekotaxonunixeviv.pdf
    • http://lovesushiscv.com/uploads/files/ragufejoverafirofokod.pdf
    • https://transmar.biz/ckfinder/userfiles/files/94886889217.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/79206930105.pdf
    • http://alhouti.com/userfiles/file/kuzabopazagolusenudoja.pdf
    • http://tvkinter.com/file_media/file_image/file/zegisapikaluj.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/38953491150.pdf
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/26333057649.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141641c19899---vibitelo.pdf
    • http://nj-rshb.com/v15/Upload/file/2021912257265992.pdf
    • http://7sate.com/filespath/files/20210904200537.pdf
    • http://soncongnghiepjotun.com/media/ftp/file/lamediviwulofupofafup.pdf
    • https://otoform.com/upload/ckfinder/files/60572734509.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b17d.bin
fba55f2c91cb7a0166c15cd71a112547cd67bc83171c2fc6bc9c09c92cbedf6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 10860 bytes
font_01_sfnt_off0000ca55.bin
6d3229e18ec10c0e85dde79d6a30a124a5be021e8a956b9096fc553ec3034b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 14968 bytes
font_02_sfnt_off0000eff5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 16792 bytes

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