Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e6d3a363965693…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 21:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dd429d84dd979f0fba5fb00608e14fb SHA-1: 6c123a747973c733a81c7a13d2b42e19c7df6968 SHA-256: e3e6d3a36396569379f1c7b07ca8fcf1070c407a25cc69c019b5239797211de3
126 Risk Score

Malware Insights

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

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 domains, indicating a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://garglob.ru/uplcv?utm_term=star+wars+thrawn+alliances+pdf PDF link annotation
    • http://bolt.fo/public_html/userfiles/files/95459396339.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/38046732408.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/42126414044.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/39985678630.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/69979292385.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/fenifalubagojijusobu.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/73134422844.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/riveramezo.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/70771777560.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/duguvekubiju.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/92088993460.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/ribezodamusodivav.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135cba6a1834---kijakukujinukebosigomo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/kasekej.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/96904280656.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/19012466557.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/98874519408.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/bogirupegubitel.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210907050407.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/besedutelufosofize.pdfIn PDF document text
    • http://autovoda.ru/upload/files/43166378121.pdfIn PDF document text
    • http://erdbau-rauch.at/31596905264.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109081500307443.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/87847891876.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/92812950815.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/89997685611.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_off0000b3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FC 10756 bytes
SHA-256: be05754a7640833f08fab7a7bba8f253be1c1d7dba7dc7d33b5a82e00a92f587
font_01_sfnt_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 16100 bytes
SHA-256: 0e03d8ff21222636f6990ecf947bdb93bca0f2a8f651752603795ac24b41ca3e

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