Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dadb4294356290…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 23:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dc8bddd6d731916e884464a1797648c SHA-1: 502c3c8b7542c6497976c5a3083eed4f711d039b SHA-256: 85dadb429435629038f9122c9cea93b43c1471cf0f6aedc7bb3604689b5654d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=best+car+in+hill+climb+racing+game
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16306913015373.pdf
    • http://skontrolsengineering.com/file_media/file_image/file/wapivujawatonumomeja.pdf
    • http://uitetenindex.nl/images/uploads/putasuvojuvuxodosipu.pdf
    • https://eastmangroup.org/ckfinder/userfiles/files/8118054543.pdf
    • http://partnerplus30.ru/images/fornews/files/40996721319.pdf
    • http://strandedtattoo.net/file/konigugoji.pdf
    • https://aakritidigitals.com/userfiles/files/wizezuzur.pdf
    • http://ranchobg.com/img/file/vipagokirutuzewukagovuto.pdf
    • http://irpuyesh.com/cache/fck_files/file/wozabipodevawurupozemu.pdf
    • http://fine-cottage.ru/userfiles/file/18940566229.pdf
    • https://birutelorasin.com/contents/files/firolipa.pdf
    • http://homeopathyhongkong.cn/files/dasikifu.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141772ca0097---80933825331.pdf
    • http://www.puhito.hu/uploads/voduzunifusibupepelolesi.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/90117526931.pdf
    • https://eledigitalpr.it/allegati/file/46175174941.pdf
    • http://iktoktatas.hu/files/file/50411822494.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e842eef3ad---59725666575.pdf
    • http://geosond.pl/userfiles/file/mugil.pdf
    • http://muabannhagiare.net/images/uploads/files/getujomuvo.pdf
    • http://acecaalcoy.com/userfiles/file/72634930919.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/24737184286.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/josebukavokomoruwuwalixad.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_off0000d4b0.bin
b1cdff2c9983f64d164b9c6faa0c97252f461035351e9ed4ca28ecc3a98639df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 10752 bytes
font_01_sfnt_off0000ed30.bin
71b7c89b481594a09b7c0d2eb0d7c2e3e3137ad8ac1249cedd61ea3858171967		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 17000 bytes
font_02_sfnt_off00011938.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 16792 bytes

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