Malicious PDF — malware analysis report

Static analysis result for SHA-256 3931a456270b6a92…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 01:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05d8ddb68c2968a868d8f2824c617a04 SHA-1: 4054db95b50ffb449a279a2fdd019b0ddc12c6fd SHA-256: 3931a456270b6a92d48a7b2fe1597fe12bf6eaa60a6d9d6be4ea4cde5bcf4237
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=mini+militia+mod+apk+download+2020 PDF link annotation
    • http://fisioterapiasuzzara.it/userfiles/files/lotoxub.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/varaxopajiwonijevore.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/zasezilitedijaxulivuvol.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/23199444308.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210916005413.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/xiguwigugiso.pdfIn PDF document text
    • http://seto.cz/uploads/154513540.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210916180128.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/dojifono.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepewodomanaledu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359f7297c49---31030538543.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/gulasejulunawomege.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/mutasebojazes.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/62608868828.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/peweg.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/50564858138.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/libuwejezijaxemisorug.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/14805967342.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/83965404059.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/76226260167.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/62239671300.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/milimuputizebabatuxidupit.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109100601241767.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091011530978.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135c254a7c61---zekaxukutufupisanukub.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/xudenupetejusidivubisuz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 10568 bytes
SHA-256: e43c560fe6dbe0f29669eeaec7a4e2918190417b64fb9f6f32cbbc547eb6afe9
font_01_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 18600 bytes
SHA-256: 0a9306078e23d4fd161976b92f84eccf94792cb70561b29e7b5651caaa828756