Malicious PDF — malware analysis report

Static analysis result for SHA-256 7713239f004a73be…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 17:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 435bfe1f2d1b104ef0d3516fc1e46166 SHA-1: f72860315bab4b7ea6e22dcbe004f1c99f49e8c2 SHA-256: 7713239f004a73be9ec6100de0e0fb64fc4827cd9679581f52b3a8f9c55c82bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as https://cructi.ru/uplcv?utm_term=venom+2+online+free, likely lead to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=venom+2+online+free PDF link annotation
    • http://tandartsindex.nl/images/uploads/34242885739.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/69006235168.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/misazalob.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/xubefirixujod.pdfIn PDF document text
    • https://binhvi.com/upload/files/munelujopuso.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/panexiximotosebuw.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/kedaxinotex.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/fizowivejewawo.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/58413432540.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/wamolud.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/17807609325.pdfIn PDF document text
    • http://change4best.ru/upload/file/tajebizukamasobux.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3622a286---75422685448.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/vatutat.pdfIn PDF document text
    • https://dm288.rs/slicice/file/88488769215.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/6480387706.pdfIn PDF document text
    • http://adriennemason.com/assets/files/liwofexivezakidibipakun.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/xesojuridivejulev.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/88975438379.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/61601006577.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614a4475ac03c---23869845287.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/84090902681.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/61256733736.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_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 10036 bytes
SHA-256: 79b65ee68faecce56a124f3a1988ad2fdb1c86386a5b7dca55c17d8dbabfc226
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 16956 bytes
SHA-256: a3c6a7d308baa33197771eee7e2c88fa0fed683c132943b75c09f3271fa52189
font_02_sfnt_off0001187f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1