Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c5d59e1ea046b8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 19:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aef74aaf10a89f84d6549f835a4b8e7d SHA-1: 024d90605755429ad2a0ab4fa5f0c9a1e22fed58 SHA-256: 89c5d59e1ea046b812b870e009923c22f4cfbef0ab1eaaf831ffebaa5ab14703
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. The embedded JavaScript is likely used to obfuscate the malicious links or perform further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=nerve+damage+in+forearm
    • https://memo-log.com/userfiles/file/vojufubin.pdf
    • http://vektor-bezpeki.com/userfiles/files/8294653527.pdf
    • http://ameshamagazine.com/js/upload/files/17223868154.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0r4s083l1j40nk27n7lkb6d287/tojobizutonidun.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/wijuvugiwedex.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/35908442172.pdf
    • https://toppelletmachine.com/d/files/39423783901.pdf
    • https://surupaceanu.ro/ckfinder/userfiles/files/fuvuxirujamuketumu.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/65091187906.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/27474685384.pdf
    • http://obedovice.cz/userfiles/file/38756973482.pdf
    • https://gaziemirkentkonseyi.com/upload/files/sevivubafifezugowanepexu.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/25678485177.pdf
    • https://inks.bg/userfiles/file/31308209765.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/70120034302.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vjk4au77v2i0f9jci3lujcmrdp/64848411135.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/zimodadujirorijo.pdf
    • https://ashasuchikala.com/ckfinder/userfiles/files/46148710129.pdf
    • http://trungtinjsc.vn/upload/FCK/file/gozafalaju.pdf
    • http://ciba.lv/uploaded/file/31227022110.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/sofekakug.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/29341348127.pdf
    • http://pitin-akutsu.com/js/upload/files/kavejesomaxop.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_off0000d537.bin
d7bc3022754e725258557fc77448d3df0318a187ae175b33ebb857966fed5b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 16992 bytes
font_01_sfnt_off0001016c.bin
351f2abfe3257444aa1ffa036e2f39cf9c9eaaa5c64d658b99fac04abc9ada65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10428 bytes
font_02_sfnt_off000118d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 16792 bytes

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