Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c301e3581f3abfc…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 03:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a0af3ffc31d40498629eb0c2375fd05b SHA-1: f6d8ffd4babda53d4f85f55aa60f190f1f8be8f8 SHA-256: 4c301e3581f3abfcf6f98c5e488e59076ee5be0057e1032b85d5a5c610005d4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content, likely disguised as a software download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=emulator+32+bit+windows+7 PDF link annotation
    • http://everestlodgelukla.com/userfiles/file/78402140286.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/87440521685.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/kikidodowokadi.pdfIn PDF document text
    • https://rubfila.in/files/file/xugabedowo.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/gurud.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/gutokudofasuxakexazel.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/xuponazemudojuwijuled.pdfIn PDF document text
    • https://davnosti.ru/upload/60723232421.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16311108561422154423.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/8173821214.pdfIn PDF document text
    • http://darec.sk/files/files/kitofejaxozujikivewametij.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/2761029620.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizurigimenatopudota.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4d3367b9c---kemelawos.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15797138118.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/270dc09ee85f34a481cb38268225b861/7344222230.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/52402454590.pdfIn PDF document text
    • http://wernitznigg.at/files/winogot.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/3037094676.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/87910142962.pdfIn PDF document text
    • http://torgoborud.org/images/file/dikirugupaxadavunejuxipop.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c727bb458690d0e6b033377c6079470f/29210822232.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/jagalomelusawago.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/miviwuzulupazaruzama.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_off0000c6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 17216 bytes
SHA-256: c69e58d04257e7eb4783ad2a1efcc82b96bf1fd7412467413483aa0d04a0a042
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 10928 bytes
SHA-256: e5d5ab0c5b6894037a03e51838ce6b666203ac50d37aa34b07dc69bb86a2f0bc