Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dc6ac26a927f89…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 18:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67a9563217c04a230cd9da96e4e8f6fc SHA-1: e9ce9589fd19615e730c94f25569d5423be52578 SHA-256: 41dc6ac26a927f89667895677a82395f699030070fd379ecdbe040d35025a83f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious content or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for hosting many links on disposable domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tort-art.ru/userfiles/file/55350534647.pdf
    • http://suachuamaydemtien.biz/userfiles/file/20176873890.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b2e3f225---xegofewulifitiwewetixaku.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16130286b1ffd3---podenipobetatoluzatapeliv.pdf
    • http://mkbeauty.vn/luutru/files/farejoro.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/54522137087.pdf
    • http://czerwoneiczarne.pl/files/file/61475719502.pdf
    • https://glearningsolutions.com/userfiles/files/17558365859.pdf
    • http://resortvillairene.it/userfiles/files/65883479895.pdf
    • https://mgrenginiai.lt/ckfinder/userfiles/files/60800403151.pdf
    • http://orzo.cz/uploaded/files/18241398920.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/41633445842.pdf
    • http://ottomaniantextile.com/userfiles/file/61324632984.pdf
    • http://heninrealty.com/userfiles/files/woboxeka.pdf
    • http://mabifitness.it/userfiles/files/tavemosigibedowomotiw.pdf
    • https://lee-trading.tw/archive/upload/files/96304927223.pdf
    • http://kovospm.cz/fotky/file/xuren.pdf
    • http://eortak.com/img/fck_temp/file/xubisonadowazawuv.pdf
    • http://barrospizzadb.com/uploads/files/10325757031.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/58574337882.pdf
    • http://envisystem.com/upload/userfile/files/25312402592.pdf
    • http://zhizhencn.com/filespath/files/20210916221021.pdf
    • http://summitremodelinginc.com/userfiles/files/35318131985.pdf
    • http://amandatravel.com/userfiles/file/32028574507.pdf
    • http://energy-labels.nl/userfiles/file/fafolapoputaludajufazo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tekken+2+android+game+download
    • 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_off0000b44f.bin
cc0adec54707142db242d345ca1eb3aaff41c7979b8f0d77cc912ef771992102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44F 14848 bytes
font_01_sfnt_off0000d9d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 16792 bytes
font_02_sfnt_off0000f1eb.bin
83cde9d7ab006c20c2228b28d56cdcb18d7f40f31e3f33eb22b5087b65401a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10588 bytes

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