Malicious PDF — malware analysis report

Static analysis result for SHA-256 688ae12d9f1dc90f…

MALICIOUS

PDF

73.3 KB Created: 2021-10-01 14:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfa70e5b86567b0054e17fa5a2f0d183 SHA-1: 4c0cf3f1b88bd58825aa579d9a5930b357df078b SHA-256: 688ae12d9f1dc90fe61a0423b8ff37ad2bb6229f37326e2b44842005cc72e65c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The embedded JavaScript likely serves to redirect the user to malicious external sites, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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 https://rtaadmin.mrv-educationservices.com/content_file/files/99182324839.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc31beac2---sagivunoba.pdf
    • http://wumag.pl/userfiles/file/40498129386.pdf
    • https://machnhaduong.com/images/uploads/files/97644882394.pdf
    • http://stacjaregeneracja.pl/userfiles/file/62048998706.pdf
    • http://ks-klinika.ru/ckfinder/userfiles/files/74135483071.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/rovapijofuz.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614226efc45e7---57416975742.pdf
    • http://grawerlik.pl/userfiles/file/madimozasazegovop.pdf
    • https://ozmutludokum.com/userfiles/file/19463188127.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/87159819391.pdf
    • https://tenfci.org/userfiles/file/fibolopawizitotami.pdf
    • http://annamsaigonlaw.com/upload/files/87604621307.pdf
    • http://hanleyresources.com/images/fupudomudixusiz.pdf
    • http://kassa.pl/userfiles/file/rujur.pdf
    • https://dcimx.com/files/91516091605.pdf
    • http://roocenter.ru/upload/file/93616190172.pdf
    • http://caerulumpharma.com/upload/files/zofituzakodawelun.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/76942440114.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/wunag.pdf
    • http://yotlist.com/uniformkontakt/userfiles/image/files/pujuxaw.pdf
    • http://artepcb.com/upload/files/notezulesikoki.pdf
    • http://hani-bee.com/userfiles/files/36914721619.pdf
    • http://bwc.lt/i/59014645068.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=itunes+app+store+apk
    • https://lapdonline.org/file/73874220765.pdf
    • 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_off0000b7b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B5 16792 bytes
font_01_sfnt_off0000cfcc.bin
4cdb39d05ad9860db3a86eaa74ca65217f32a753f3b31a1f333f2435f3328615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 10248 bytes
font_02_sfnt_off0000e6fc.bin
4fc1ec1f70cf60b5bf28463f5e1131fb8218e2ab9348f2dc050c58fff136e7af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 18872 bytes

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