Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e57ed76c827c0e4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 16:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f844f90dd149c3f586cb8939dc222e2 SHA-1: 9bce18cd6e3cd4b7c167fa33c05f4286993ea043 SHA-256: 1e57ed76c827c0e4741bd6ef8d78a7e3d7ed281f1de998aa926946d54547af66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm or phishing lure. The authoring application 'wkhtmltopdf' suggests the PDF may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=gold+forecast+next+5+years PDF link annotation
    • https://rafautama.com/uploads/file/66837868417.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/xizijanumozo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142882f3a73a---98794663376.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/lozibijaxovejabef.pdfIn PDF document text
    • https://lesura.net/userfiles/file/gukobufebi.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/96472730164.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/67878058638.pdfIn PDF document text
    • http://mweb.cz/images/file/27032234498.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_055648.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/84055577396.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/namewisufugokulezazu.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/63246889959.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/14116260604.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/masamenivojilazuwonar.pdfIn PDF document text
    • https://fobh.net/userfiles/files/3894445402.pdfIn PDF document text
    • http://plncse.hu/php_data/file/kijidilu.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/sakopefofesodisi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446773141fb---mujuxiriviwone.pdfIn PDF document text
    • https://micsys.in/userfiles/file/wexosomo.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/71053977900.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613815fa6629d---32677579224.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/tupepi.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/36579518456.pdfIn PDF document text
    • http://apvn.info/userfiles/file/maxekelelonuxom.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_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 10764 bytes
SHA-256: be6335be9db1c498e76dc5fd0a43d548e63fe6147605c87242472827f853168c
font_01_sfnt_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 17620 bytes
SHA-256: 62006b8f0d5dc078704666273ac8d0fdbe0a5f002de3d11489be6b32010f98db

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