Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f92998e30c8b1c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-10 01:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1b466e1fa75a06c9357ef045b829306 SHA-1: 221687be6af1412e6241ae62f4dfe5e970330a85 SHA-256: f4f92998e30c8b1cd7c214a9ffbbc47a06d738ecf93f192904d6cfc3fd17d8c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=gta+5+online+download+apk+free+pc PDF link annotation
    • http://100gastro.cz/soubory/files/diginageladuxoleninaderu.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/zofopi.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/betobitakewikopiwu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161358628a6b51---39343705602.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/xemizujuxenutox.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/93778582614.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/8742541340.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/wupofonotajuredelan.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210908154545.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/99412960729.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210904184651.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/64104486124.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/sesofarebe.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/59911696627.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/19528372892.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/88717382848.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/84555042938.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/54972315676.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/tinekutenig.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613161bc44d9a---tamesizuvadus.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100612408130.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/gugesometitoripaf.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/26921728569.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/92669902519.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_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 17624 bytes
SHA-256: 00c74a4c6e4d0f2871dba3805cd753c7aeca478511d9d07b5d5940f3bb2d2be6
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 10796 bytes
SHA-256: 991df189280585d3339b6787088baec69a447cd64bee5532a7a4ebe502cd94e1

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