Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8c88f75f5ad6da…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 17:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf95aa73b3652561123a9152c172d937 SHA-1: 779ce03304b23d1669a2ccc908b4ba6dc4364d9b SHA-256: 1e8c88f75f5ad6daa94f9f75e0feb95b132a5d9c19be260cf825c1074384815b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs indicate it's likely used as a lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=free+local+tv+apps+for+firestick
    • https://weilmclainboiler.ca/fck_upload/file/95692386378.pdf
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/bugixo.pdf
    • https://tort-art.ru/userfiles/file/nobogubenitagef.pdf
    • https://sharmtocairo.com/userfiles/files/lavorumorelezaxugurol.pdf
    • http://studiolegaletrotta.eu/userfiles/files/42045878290.pdf
    • http://asupuro.com/upload/save_image/files/46411147827.pdf
    • https://seikai.jp/free_images/files/63109085362.pdf
    • http://nghieuphong.com/upload/files/xaritifezajon.pdf
    • http://takramaipai.com/mypicture/file/nivugorawitowibixadamu.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/68681045592.pdf
    • http://happyorderfood.com/uploads/files/16264101243.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c26eaef366d86e9ba3e9a1af7efc9706/23699739545.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/xijizojigoludewepamar.pdf
    • http://irinaburmistrova.ru/files/5473242037.pdf
    • https://hilanguage-com-tw.triangle-design.com/files/16996951368.pdf
    • http://secretinvitation.net/images/files/kawadotajekute.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/k62fnh9pf1qkqsfltk0rdrjtn0/fiditolopuguzuwitukofidiw.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_off0000bc45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 16792 bytes
font_01_sfnt_off0000d457.bin
d813ce48f2344dbd82c8e1dc4e0ace42b4d462bea594fe4715a71006dd66256c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 16564 bytes
font_02_sfnt_off0000fe99.bin
518c1d3c6d6f655a0274a4dd98252927728c778de8d8649c588617bf20ac9b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 10504 bytes

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