Malicious PDF — malware analysis report

Static analysis result for SHA-256 586c35af7b021481…

MALICIOUS

PDF

67.5 KB Created: 2021-10-01 02:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 442dec065b7260ee4f81d13181eed9c6 SHA-1: 20ad4d1823a4783383e2dd64dd5c81553e97647a SHA-256: 586c35af7b021481256f6e9bd306d3c6931b687db51eece9a3cf7ff6939b09dc
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. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious domains. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=tarot+app+android PDF link annotation
    • http://edituj.cz/res/file/44334279623.pdfIn PDF document text
    • https://htmlpanda.rockeit.com/userfiles/file/juxemag.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/bifolawudubuxajosobogekug.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/78146692871.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixesajiwiradejoma.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bodepakururuwafonolo.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/woxufinorukivo.pdfIn PDF document text
    • http://strandedtattoo.com/file/18015411307.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/62727145734.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/52406887659.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/9444967490.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210914103815.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/36920477665.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/42810117694.pdfIn PDF document text
    • http://philipsphotographystudio.com/vegovulafovom.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/858a7817066123b7d9f84c1725816146/soxoxuzidopaginafetuso.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/88469498003.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/82258762720.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495aab23001---48987203063.pdfIn PDF document text
    • http://headrepublic.pl/images/files/jexevifumedeba.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/xodudemoxaxe.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/zikapadokuvoturutawuxi.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_off0000ac5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 15268 bytes
SHA-256: 9cd5c03391db66cec259b25a3a06de1e12cc2cc9fbb785c5fb7daffa6b83049f
font_02_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 10000 bytes
SHA-256: fe14154569d84d41a308992df90eaef58a47de8435b4329f9176fc0b1d28d4fd

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