Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d58f124b851d79…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 17:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 05371c74bc1fd481032698c5b05ae749 SHA-1: f8ea99afa5e5a11a731bac3323ff5f2ed0f1ddd3 SHA-256: 21d58f124b851d7908585a4e2b8514a98db66603779fd620e7188977242a957a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of JavaScript points to T1059.007, and the overall nature of the document suggests T1566.001 as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://traktorpulling.de/ablage/userfiles/files/ragivamutuwi.pdf In PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/56881757007.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/52916797710.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/31hd8vmjkaic1noe19ccdjdqbh/37186020907.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/69198578861.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dcead2efe---45798644931.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/bebelanipi.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/lowofilepamukil.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/nejetatujof.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/54284177214.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/lilis.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/27285817034.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/vulatuzebabavologuvajij.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/warekapuvinewezoboripan.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210918_201134.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/kejadutavovek.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/buvewitam.pdfIn PDF document text
    • https://tpk-m.ru/files/file/paludalanazox.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/zakamen.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/69211945989.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/nufamukum.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902101512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mobile+repair+app+download+for+androidPDF 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_off0000c02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02E 17788 bytes
SHA-256: de098a5cf1b3e27d43c44d82df605934147e2ea523597e5f6f28253ce8b6371c
font_01_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 10444 bytes
SHA-256: 2189a60f03f33a3c26499e6bc0d85e489ba8e272cf098bf64171e37273b25685
font_02_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.