Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c247cbf69d5095f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 00:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be2def8b36cfdda8e26bec3a4ce3bdae SHA-1: ab289d07e9923e679041e17e1160859f64f64113 SHA-256: 0c247cbf69d5095fbbcd23aa29c5e8e30dbf6d997c986713ed28db9e8902967f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URLs suggests the PDF is likely used to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://ctcitsupport.com/media/files/nedasulajejelotebazew.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1593d3a9fb860890b5aa199fa4d3091a/27924614414.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/19602563323.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/38111935272.pdfIn PDF document text
    • http://chinalabware.es/d/files/lavazupewebewanuje.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/3431654519.pdfIn PDF document text
    • http://darstin.com/userfiles/files/23981448574.pdfIn PDF document text
    • https://bdata.vn/upload/files/bagurexoduxatadum.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/99387661108.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/lazekufasovezenusefonene.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/95313251776.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/48235364193.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/56121834013.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaddbda795---84753187007.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/988814941.pdfIn PDF document text
    • http://hkwwta.org/userfiles/89837966832.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/62659706838.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/zafidurorol.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/2989099258.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/tuxudopakuno.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/79328008065.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/bidexamobedifalowevanupi.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/sologabebej.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/30853010372.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/46156431484.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/73075259383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=advanced+data+structures+and+algorithms+pdf+for+m+techPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 17772 bytes
SHA-256: 415f36e26da0de9ad061446bd1bc5e7c23fb2ec87fdc877e5aad15cdc9b24fb7
font_01_sfnt_off0001139a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139A 11212 bytes
SHA-256: 079fa096ab12a447f98121115a7f38e8aa88118d711043f71c357531e0990814
font_02_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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