Malicious PDF — malware analysis report

Static analysis result for SHA-256 af191357817d1e01…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 11:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4e61ed6dca139b3e898b72407c811f0 SHA-1: 8b7f343cd835243a2045b1cbf6f0031055a80bd0 SHA-256: af191357817d1e01e6652d3bed0516d18d78a6e9f423f4b454217ca201c5ff71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://futimisdev.com/userfiles/file/26244523519.pdf In PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/71797315258.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140639fa7e3d---wusetunividital.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/10517231546.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/564861636481630975818.pdfIn PDF document text
    • http://elma1.ru/!upload/files/97838912944.pdfIn PDF document text
    • https://kimansion.com/uploads/file/11681147298.pdfIn PDF document text
    • http://jfe.hk/userfiles/6860912246.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/52823368133.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/80057911623.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/82869737586.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/kirajuxit.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/40996306314.pdfIn PDF document text
    • https://tsegypt.com/file/gopagukabusikafixo.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/tuvevapa.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/88751003889.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/mugupudibiviva.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/71672182972.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/kigujiwutagexesezevarodig.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/78743318468.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/dolepezozun.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15335773a---19160716561.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///96240405988.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/gotanefike.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/vadex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=evolution+of+mankind+timelinePDF 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_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 17988 bytes
SHA-256: a9033d0fc7fc5f4d56f2850fb3151cc84e36cd75ad595aab9d58d33ca2bf88d5
font_01_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 10488 bytes
SHA-256: 3b91dcb4747d0f6c8e88ef9abbea7d1874f21f759349d8c282770ef190e6fed0
font_02_sfnt_off00012652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1