Malicious PDF — malware analysis report

Static analysis result for SHA-256 d245838a5012d2b2…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 11:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8809d3096c86c804b942d38f9d4a2c6 SHA-1: 65e33db443510ff7f3f69f80c0da253dd5177280 SHA-256: d245838a5012d2b2220943f3181c68f71a9473a0d4c0c6a8f9805b027750c665
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable or used for hosting malicious content. The primary purpose seems to be to lure users into downloading further malicious files or visiting phishing sites.

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://archism.ru/uplcv?utm_term=tiles+rascarlo+apk PDF link annotation
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/98498540867.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/taxipadojosefon.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/fopiwuvi.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/24973907407.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/pokusibugepe.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gidulabijibizijubiwedunoj.pdfIn PDF document text
    • https://laps.pl/userfiles/file/56145294284.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/95081827605.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/bd20dc9321c8d40e7a4dab4c829e6977/pokusanugaxasilenarafuxi.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/rokiponagase.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/71843843878.pdfIn PDF document text
    • https://wonkingchina.com/d/files/xanajikuxojetoro.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/73420361276.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/97750212996.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/dogikowowodupi.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///43486535777.pdfIn PDF document text
    • https://kermanrooz.com/img/files/30610561333.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/xuselejaregupiresadalun.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/1294095574.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/nasedovazijewoxoliniju.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/megirufefifalomupev.pdfIn PDF document text
    • https://stvorki.ru/files/file/47562845336.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/66625156767.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/90404266261.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/4395521774.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16156421ed1e24---91195350329.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_off0000b362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB362 10220 bytes
SHA-256: 51046d76ed4d4a559fda7f2805a0a1de547250debd47ae4067ed75e7bec7e30a
font_01_sfnt_off0000ca6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 14416 bytes
SHA-256: 82a56b9031a1ab9ed7ea6e8313fc3b334c92e66a23a17cc756936706634262b0
font_02_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1