Malicious PDF — malware analysis report

Static analysis result for SHA-256 40908e6836b613dc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 16:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3327e914aeb5a69dbe58a1571b23c68f SHA-1: 02f1278ba572dba1a0ee41f1763ae224bd7d5e07 SHA-256: 40908e6836b613dc8f23df335a698f30bd8d0162daa4c656c05e5e1b3b807203
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to host numerous links, likely for malicious SEO or to distribute further payloads. The ML classifier and ClamAV detection confirm its malicious nature, with the embedded JavaScript being a common technique for initial execution or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://htijsr.com/userfiles/file/72438123933.pdf In PDF document text
    • https://gymlesgeants.com/upload/editor/file/67008567770.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/62523594007.pdfIn PDF document text
    • http://sro52.ru/uploads/files/nemoxavitesifenofadena.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/65116608139.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6ff9d22be5959147c9d9adb2e608642e/39558070003.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/68750448364.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b1e7sep68k3ehv9a2j3g4cdsmf/gakewod.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/rimogid.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/65059786985.pdfIn PDF document text
    • https://kawanmto.org/contents/files/zediwom.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/28211285436.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/49268516505.pdfIn PDF document text
    • http://effekt-film.de/files/file/vazokopegezokamejovije.pdfIn PDF document text
    • http://lecostationery.com/files/file/nagefewitit.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/24920370793.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/lorujifuxi.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/geriberej.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/rarobejovobaridegitex.pdfIn PDF document text
    • https://petala.gr/userfiles/file/botavotosube.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/24919402086.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/nevejevemetitow.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/xukosaxugezimoke.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/vemalanunupivezabowag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gta+lcs+data+filePDF link annotation
    • 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_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 18216 bytes
SHA-256: 4ba7430d7e598af5f4517e25ae9fd9f8467a371bfca345022f170f40b2fb9560
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 10184 bytes
SHA-256: 35ec88ec2dca88298312f8b5cf884f7bcb9c48861f86ee87d217644c16e2168e
font_02_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1