Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54e6bdb91a7ea63…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 03:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 468204989c980cc644247d08378e89eb SHA-1: f2a0477f3460985183394952083007ca457dfb69 SHA-256: a54e6bdb91a7ea6320389189641e62adf1d7b1c67b979245dc7896e5e0b42872
166 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs and the explicit instruction to disable security software strongly suggest a phishing or malware delivery attempt. The ML classifier output of 0.996 further supports its malicious nature. The document body itself is unreadable, but the heuristics and URLs indicate a likely attempt to lure the user to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://coretry.ru/uplcv?utm_term=among+us+always+impostor+mod+apk
    • http://zs-oilfieldequip.ru/d/files/xeloriviwukekavujeri.pdf
    • http://abwrichmond.com/uploads/files/46877985459.pdf
    • http://jamxmpharmatech.com/upload/files/pagipu.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-29/20210929062241886075.pdf
    • http://raffaelecavazzoni.com/userfiles/files/litinakixogadogamepo.pdf
    • http://www.gc-antey.ru/ckfinder/userfiles/files/lepidud.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/metapezosufogotubagade.pdf
    • https://mi-stores.com/basketballtotaal/images/editor/file/runatibonodu.pdf
    • http://domadoma.cz/userfiles/file/72696840829.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d022650da---wenivumibirodirobewe.pdf
    • http://www.ecvbrass.ch/user/web/file/81729201644.pdf
    • https://bodymason.com/user_uploads/files/60454379550.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/91067022735.pdf
    • http://telegid.tv/userfiles/files/titobojamorejewikudan.pdf
    • http://studioguagnoni.it/userfiles/files/40931020382.pdf
    • https://indiantalentjunction.com/milan/media/35859808865.pdf
    • http://gnatowski.pl/attachments/file/94079898086.pdf
    • http://rowadhr.com/app/webroot/upload/files/64059575065.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/18640129732.pdf
    • https://myvideoclasses.com/ci/userfiles/files/wisimereduwubekirasol.pdf
    • https://ecoolteh.eu/galeria/file/24983622457.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210904_15ED8B5CD4CDD99F.pdf
    • https://fwstc.in/userfiles/file/33203732981.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210923_CDD4EF09FEACBA22.pdf
    • http://3dsami.org/uploadfilefiles/bamed.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_off0000b069.bin
2964580af652427795a1549599a336e3790540a18956b6c2a018211f8ff08ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB069 14364 bytes
font_01_sfnt_off0000d4a0.bin
a37bb3212abafaebb0e99f41f9dcf34a3ae82233dde8dcf53ff88e6ae295c157		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 10976 bytes
font_02_sfnt_off0000edfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16792 bytes

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