Malicious PDF — malware analysis report

Static analysis result for SHA-256 705e64cf37974ffd…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 20:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5bc168a1043778757e8b1b5a6cd4f8a5 SHA-1: b4c74b5cc929eac289db78cef2bf3f656910f44f SHA-256: 705e64cf37974ffdaf9c0fea8145272cca68352873f64cb82bba906c64295f3d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://anpharma.net/upload/files/98214185779.pdf In PDF document text
    • http://milwaukee.center/userfiles/file/kobit.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gipebedizonivap.pdfIn PDF document text
    • https://dalba.net/other_files/File/linoxovam.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/nidexire.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/24686927548.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/88612806160.pdfIn PDF document text
    • http://boki.hu/editor_up/87296186744.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/logebijamerotutox.pdfIn PDF document text
    • https://superchills.com/userfiles/file/19884422581.pdfIn PDF document text
    • http://runhouchem.com/upload/files/wojijubi.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/73046249777.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/52643165093.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/livoleximoved.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/ronebakeradododajale.pdfIn PDF document text
    • http://mousike.it/img_ins/files/24927208852.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317bb5dddad---99814362014.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/sujavanurimurugenufulu.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/72360714086.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/75095596703.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/79331179591.pdfIn PDF document text
    • https://wasael.com/userfiles/file/fibejujipita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fall+guy+online+game+freePDF 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_off0000c092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 16400 bytes
SHA-256: 02e29f6d844502cb7159920c10188ab751aaf267ffdb60a7328d417895c55edd
font_02_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 10480 bytes
SHA-256: 5ba7acc6b82becf602c4b8fb14f60b9fe831ec95e3a56d8bdffa3b8447dbc085

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