Malicious PDF — malware analysis report

Static analysis result for SHA-256 876f695bd88bd89f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 02:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6232ec30e328d627d52221cc87764595 SHA-1: 9e059cda65d0c70afe3337928a8153daa7595fab SHA-256: 876f695bd88bd89f855854a20999b65f2b9e3100c7f760034fdf2b82ba023bac
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malicious redirection scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, indicating an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://synerhu.ru/uplcv?utm_term=toefl+vocabulary+pdf+2020 PDF link annotation
    • https://crbz.ru/userfiles/file/fusakupotisagokefowetes.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/larutoxodifiv.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/nuzakagideworudagifizuger.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/70186430387.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/zaguwudeguvapar.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210918_053812.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/94363240850.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/kemad.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/67651158873.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/31554273470.pdfIn PDF document text
    • https://sainaudit.mn/File/kafuruv.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15a19190c---97465330765.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/26396159857.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/42985630450.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/mijenasejuzileti.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/ridugitamegutu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/42116125986.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/sigejo.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/gakene.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/83540406853.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/86239161958.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA43 19588 bytes
SHA-256: f345388448862a2fefd912094454dea9096a92d6d038d37a0d4c46f58e956e9f
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 10776 bytes
SHA-256: 606decb6418e062991e0b2ca065faaf43e4d1bdf35b3e4294ba6955ca356ba4f
font_02_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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