Malicious PDF — malware analysis report

Static analysis result for SHA-256 0780b7dcc892b4e6…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 23:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 90194a74932c3b0f4fd02409bf369346 SHA-1: 7b6dc64d03af500ae93c13b68ea8ebdc4991dce6 SHA-256: 0780b7dcc892b4e6b7f0b595182ff69bedd7ad8dbead037e2fb3ed547abf5dca
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It employs a social engineering lure to trick users into installing a fake browser extension or update, a common tactic for credential theft or malware installation. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=xnspy+mod+apk PDF link annotation
    • http://nrgmedia.hu/files/file/rexelepabope.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/tefufapu.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/xarapabafefinafel.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/gujazoxira.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/4186862378.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/fofosape.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/vazotumifapegug.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/zepup.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/jizomuruwepo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131081adead9---mirajozeluwizi.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/72015463303.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1aa17ee6---92812653150.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/momajejenolagugobimojatil.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/kitumowegetuluxejimap.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/91060709483.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/difokafirasoked.pdfIn PDF document text
    • http://dd-eng.com/files/files/83955908689.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/wisopi.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/papiwebagidumadodimefovis.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109060223514879.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_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 16936 bytes
SHA-256: 3da0accf22cc1adaa47a37cb7a7bd6d65dd8d1309145c6cc21fcf95b22e91908
font_01_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 10300 bytes
SHA-256: 54d3be5630d4cddca5989c7b9711ae4b8cf0e663d30081c0ac1bd3b16f0c5131
font_02_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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