Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bbeb56b7d9f573…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 22:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c93b904c9aefa768da1f4f3951ef0c0f SHA-1: bb829336a3e2d247889a79ead618dedbe4a50963 SHA-256: e5bbeb56b7d9f573ad2b5b3d5735cf08d3f74b4f4880e3b3d1ad00762eca96f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, consistent with a link farm used to redirect victims. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/aa46e91426434145568b9fa0ef57c8bd/rozuvul.pdf In PDF document text
    • http://vpecargo.com/userfiles/file/56362967809.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/bimofekuverivuxigaxu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/53401356168.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/18264000336.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xotafa.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/50538507152.pdfIn PDF document text
    • http://klinok-saintp.ru/files/29261209410.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/dasawotezol.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/duvuvawaredijatu.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/dubadovugagawig.pdfIn PDF document text
    • https://svltv.in/userfiles/files/sedudezisujelit.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/98873586688.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/67233218547.pdfIn PDF document text
    • http://kahasat.cz/data/file/zojuji.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/kamugenunimebalavunuke.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/dafuzup.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3b19d4bc6---4941984862.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/23516277320.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/jalovafilovodimexinowupit.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/dereve.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/gefetetunemategelafedabu.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/rabevodotunodafusugusuwo.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/pezawodojepe.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/lagaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=unblocked+games+911+bottle+flipPDF 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_off0000b048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 11320 bytes
SHA-256: 4313de7a791942ecf6fef5f7c2964990ab1cbb1e96a36e3746381feca0edbd9a
font_02_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 16356 bytes
SHA-256: 19d7bb3ccb79d27a8cc0a4f6eafbfc7f941816f34733030d5cd1fb6d9bd476dd