Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4896c445f50f6b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 03:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ce4f6ff4499cd92fb090659daad771d SHA-1: 692fc86ffd9ddeafea838eb2e90e9797447c567b SHA-256: ac4896c445f50f6b629952e18e6deefc4fd59d2ff5d56692de9ac9d91e277be6
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external URIs and is structured as a link farm, indicating its primary purpose is to redirect users to potentially malicious websites. The presence of multiple PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=true+blood+season+1+download+480p
    • https://skywaynepal.com/userfiles/file/12471503419.pdf
    • http://medrea.ru/upload/files/57361744211.pdf
    • https://habibitours.org/ckfinder/userfiles/files/dovijirulober.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/mudifelamizu.pdf
    • https://businesslife.com/content/files/40288535399.pdf
    • http://hide-bo.com/img/tmp/file/jeponotelalakupuwusise.pdf
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/xemepi.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/1163986520.pdf
    • http://recuva.kr/upload/fck_img/1632196055/file/soxuguregavit.pdf
    • https://carsen.sk/editor_uploads/system/files/rakinotelapesawawiloxafi.pdf
    • http://17njl.com/userfiles/files/69867857029.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/guvujosamagefavomu.pdf
    • http://kammerchor-lindau.com/file/nufuturusezorilijes.pdf
    • http://rem-proekt.com/f/file/bavovuf.pdf
    • http://www.petersonassoc.com/emailimages/file/wujiretoledenop.pdf
    • https://sikahaiphong.com/images/news/files/8267117984.pdf
    • https://rajatotogroup1.com/contents/files/51249873772.pdf
    • http://tingchucontrol.com/Uploadfiles/files/88171427043.pdf
    • https://stop-remont.ru/ckfinder/userfiles/files/63913752017.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/babogidaxinozexopekep.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149535e35987---22393712670.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/16951826813.pdf
    • http://snap-drone.com/userfiles/file/97112228246.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491d7aba412---90723825910.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_off0000af58.bin
09e2491753652393d7ece460bf1ea570a3808394360f6d38a6e1471cb2c38eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF58 14648 bytes
font_01_sfnt_off0000d454.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 16792 bytes
font_02_sfnt_off0000ec6b.bin
671bd3ccdee70cc07fcdee30f02be97d5b4c061707950910210a1a3a8018d20e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 10944 bytes

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