Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c84ec18352f814…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 03:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1e78924bbdc58049e55e0459774c06a SHA-1: 599d16822003a63fcbb85666fa42bd097c094954 SHA-256: d7c84ec18352f814a10c35513c6697ac97c161a0a6f55c98b3860ee033f95474
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable hosts. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely to obscure the true destination or to distribute malicious files. The embedded JavaScript suggests an attempt to execute code, potentially to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.hgbehringer.de/img/files/files/78954210169.pdf
    • http://oldmotorsclub.com/files/file/zufopinodapenezovu.pdf
    • http://electriccityusa.com/images/fck_uploads/file/jabenenutum.pdf
    • https://pushtypathshala.com/demo/aims/files/images/files/5319474751.pdf
    • https://pmsp-me.com/userfiles/files/zopedix.pdf
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/lapuloraso.pdf
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/79700672727.pdf
    • https://edinburghpools.com/contents/files/purepuwusufatulufit.pdf
    • http://dansensvenner.dk/imagesfile///zarufo.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1fa3473f---zopevifamamub.pdf
    • http://recrute.fr/files/files/wamebuga.pdf
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/22587314495.pdf
    • http://abwingsva.com/uploads/files/17396637286.pdf
    • http://pazzo.jp/js/upload/files/39234434864.pdf
    • https://tolgyesvolgy.hu/userfiles/file/6921767728.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/92801570461.pdf
    • http://wieswioska.pl/userfiles/file/bininunizexitokeroke.pdf
    • https://fratellifurloni.it/file/wodetiva.pdf
    • https://dcicz.org/userfiles/file/winanago.pdf
    • http://shinies.ru/img/lib/file/94834968889.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/ziremamozenez.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/90234707445.pdf
    • http://novichiha.ru/pic/file/guwowiwodaxodida.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce7ddb927---12375608769.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+quick+shortcut+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c771.bin
39811afc4a844341e8821b0eed4ede453d9a180db88b8efe74b116d8583d7934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 10904 bytes
font_01_sfnt_off0000e06f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 16792 bytes
font_02_sfnt_off0000f881.bin
899c3d9961fca6e8b6fffa3e339d4ba8ba2483c2fdb9e8cb16fca29345ba554a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 20684 bytes

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