Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3b475db77cb67b…

MALICIOUS

PDF

89.3 KB Created: 2021-09-12 15:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74d2176553712fa601b17fe5a86cf474 SHA-1: 7e073f0e2b4b68c47e37af6da0ac5363e335f517 SHA-256: 7f3b475db77cb67b1b5db7abc3389a5f2d5364ca96323b231632816efc249bbb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links pointing to disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://muasamhangmy.com/ckfinder/userfiles/files/misafexumenanasose.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/pusaledigosibo.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/zakimigitisulizapumat.pdf
    • http://henzefashion.com/userfiles/file/nogipotadu.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/fowuduwosisotajonim.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/9637725935.pdf
    • http://glttek.com/userfiles/file/fokagimuzujeve.pdf
    • http://union.travel/ckfinder/userfiles/files/wudazolodifaxiv.pdf
    • http://ccswcd.com/userfiles/file/46217949990.pdf
    • http://taigesw.com/upload/files/zadumupeze.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/55642327056.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/81075960383.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1to34q1fafgra9a73dsic5vg81/19312292170.pdf
    • https://unicorn.mn/js/ckfinder/userfiles/files/zegalawobalevok.pdf
    • http://www.globalnautique.nl/upload/files/mizobuta.pdf
    • https://ruta.hu/ckfinder/userfiles/files/rapadawavafefu.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/63660172056.pdf
    • http://najlepsietorty.sk/uploads/fck/file/disepifovutufeg.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911171801985996.pdf
    • https://hiroyoung.com/data/files/40304380994.pdf
    • http://fasson.vip/images/editor/files/10771759027.pdf
    • https://jagominum.com/contents/files/15179474376.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/pinewevulofov.pdf
    • http://tochalco.com/uploads/files/44835520380.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315bd9e1244---56712076250.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apk+for+thoptv
    • 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_off0000fb91.bin
47e8120f2bb948f5d9a9d1d7d95b5971da5b3bde4a34c341ddb52b9c220d310e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 9888 bytes
font_01_sfnt_off00011188.bin
294bf3c04af0bb15abb68bc40abc039759dbc2258076e2510f855e86ef23d56d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 17996 bytes
font_02_sfnt_off00013f9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9C 16792 bytes

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