Malicious PDF — malware analysis report

Static analysis result for SHA-256 d192cf91de36ab91…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 13:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46d50f5dbd9b6e8548715ddd4c4f84e5 SHA-1: 087fa66b1f1a238aab2112a65d38851902922d73 SHA-256: d192cf91de36ab91afaa7f3e0166eaae1fe630f5f00df6b5612f86bc1a40ef23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://farmaciacogliate.it/userfiles/files/zafukunuzajenu.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/86106386843.pdf
    • https://777mto.info/contents/files/65757694859.pdf
    • http://dongbanja.com/userData/ebizro_board/file/9494935228.pdf
    • http://myagreement.com/UserFiles/file/pugasup.pdf
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/44352855124.pdf
    • http://shmgec.com/Uploadfiles/files/bofivapilepafamagomagaz.pdf
    • https://alate.org/admin/fckeditor/editorfile/1563050976.pdf
    • http://greensketch.in/userfiles/file/wotima.pdf
    • http://saigonford3s.com/uploads/2021-09-10/images/files/jenok.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ph99u5dtl2v9n39jelhmqmnt8v/7046641015.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/lobubawe.pdf
    • http://eco-building.cz/UserFiles/File/bezapiw.pdf
    • http://gernano.eu/gfx/userfiles/files/99082791837.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/fukarozoni.pdf
    • http://tupnate.com/ckfinder/userfiles/files/72695998202.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/xodewokokimil.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/22368840377.pdf
    • http://irinabailey.com/upload/files/pusofavanovadozil.pdf
    • http://igabana.com/upfolder/e/files/20210916105301.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/varoleduzoke.pdf
    • http://hurtowniagrafit.pl/userfiles/file/gafujezixizuravexufebetis.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aafc47bb3f---nimefegepop.pdf
    • https://812423.qqtogeljackpot2.com/contents/files/25256448286.pdf
    • http://harchovyk.com/userfiles/file/52979665129.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=backflip+madness+full+apk
    • http://s292376414.onlinehome.fr/datas/imgmail/file/94314602480.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_off0000c24e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC24E 16792 bytes
font_01_sfnt_off0000da65.bin
cd64dbd9b3c571595cd8c2dd7b1b8b7180db943bcabbe97f462c2b7d51f070ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 10708 bytes
font_02_sfnt_off0000f2f9.bin
ce2b4fa797b9261d06412616938c92b066c7d2cc47da39dbb5b507dd4d314295		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 18416 bytes

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