Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e699d40ec21b1d9…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 17:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de287f39a2e5bbc61e6c1614b4274eb6 SHA-1: 69bb96f6cc7667e563071b9f698db51c270673bf SHA-256: 7e699d40ec21b1d9cebcfc4104ca5047ccc42ba09584979c57544e6b250f51a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. Heuristics indicate this PDF is a link farm on disposable hosting, with one URL specifically noted as a redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=android+ui+kit+figma+free
    • http://fedime.org/imagenes/dovawaka.pdf
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/viwixaxaxifupuped.pdf
    • https://nationalshield-uae.com/userfiles/files/sesofatuvamotoputafo.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/juderepurusolilazemome.pdf
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/pefutilanifegipox.pdf
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/zepofatefe.pdf
    • https://derfo.info/resimler/files/87482364831.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/80584956958.pdf
    • https://rajatotogroup4.com/contents/files/98495501039.pdf
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/81161848689.pdf
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/xojagojekupebiparo.pdf
    • http://numismatika-nbkpdy.cz/userfiles/file/bigupomoru.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c93e45730e---vakozadipokefetak.pdf
    • https://siriusdynamics.com/assets/uploads/files/rolera.pdf
    • https://datajournonepal.org/files/gepefuwopotomifo.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/xidezegegomozigexonu.pdf
    • http://veganogle.es/uploads/ckfinder/files/rofejidagozexetifovuwezu.pdf
    • https://audreyheselmans.com/_files/file/28154469725.pdf
    • https://jecoexports.com/ckfinder/userfiles/files/pugisupabomesaluda.pdf
    • http://yao-cheng.com/uploadfiles/20210901020513.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/74929345260.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933511cb93---dizunedewasasadizokebib.pdf
    • http://czdashan.cn/uploadfile/file/2021091012523073499.pdf
    • https://adminico.nl/userfiles/file/19457068342.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_off0000ae8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8E 16792 bytes
font_01_sfnt_off0000c6a5.bin
36eda849163575ba69bdfc39129c1be39df32f6c62f6acffed2928e76432b5da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 10656 bytes
font_02_sfnt_off0000dee5.bin
2ef5a72d7d91dcdf35c0614c46574388ce7bc425fcebef92bdc10f7812ebd48c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 14460 bytes

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