Malicious PDF — malware analysis report

Static analysis result for SHA-256 98523c8f04ad2ebd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 01:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68d6956cbb125238153eaae6448f34d3 SHA-1: 0cf8d8cd54a0ec4a3bf58000447e56c4a0087649 SHA-256: 98523c8f04ad2ebdb8a8b926545b42496703d8c35ac02656de03d1cb7e34b598
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable hosting and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=watch+the+bachelor+putlocker
    • http://daiichilogistics.com/uploads/news_file/loviret.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/kiduv.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/fetedukiw.pdf
    • https://texigo.tw/upfile/files/2021/09/08/toguvaza.pdf
    • http://problemconsulting.com/img/download/files/51786744200.pdf
    • http://solarissoft.com/img/userfiles/files/kanisatanexobulesofukevof.pdf
    • https://pointvirgule.ca/upload/editor/file/24060876471.pdf
    • http://distant-property.ru/fck_editor_files/files/76797076234.pdf
    • http://aftckwt.com/uploads/file/rifipoxivebogorabipav.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/81435245906.pdf
    • http://gartenbaukoeln.de/uploads/files/59858694996.pdf
    • http://tiga.co.th/ckfinder/userfiles/files/bipixituvanidet.pdf
    • http://ibrahimalsada.com/pics/file/komale.pdf
    • http://nissanotogovap.net/uploads/images/files/73889255991.pdf
    • http://lindendirect.com/tempimg/file/3124615904.pdf
    • https://agros.net/uploads/file/1721377315.pdf
    • http://aktien-analyse.de/images/File/kemejesibimasizimojazo.pdf
    • http://abimobiliare.pl/pliki/File/60740806202.pdf
    • http://weingut-suppan.at/files/67352967738.pdf
    • http://elmbbq.com/uploads/files/58435296102.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/2223232795.pdf
    • http://soeurs-scjboran.fr/soeurs/upload/files/77935282436.pdf
    • http://casaledellasignora.it/userfiles/files/32555721044.pdf
    • http://prvugkh.ru/uploads/files/59752804855.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/57192033295.pdf
    • https://bomando.bomsolar.com/uploadfiles/files/69759478642.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_off0000d617.bin
300f40495092e813d895f8985660954f4a3b7c7316965e178ef9bb58daaae3f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 18200 bytes
font_01_sfnt_off0001053b.bin
f5f042c51c380cd90f123d503b14e864f950208c13bb1875d1090d340e609ab5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 10432 bytes
font_02_sfnt_off00011cdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes