Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b7b12c05e38cfa…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 22:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 579596a381efcb8fb30a5695fb270790 SHA-1: 982c3b3c0435cbc980263b196df4a743f5efea79 SHA-256: 99b7b12c05e38cfa8828478640f5b6fbae8ade6c3ea69fe7b7fe66955c98d25f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The high number of external links, many pointing to disposable domains and using UTM parameters, strongly suggests a phishing or credential harvesting campaign. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=final+fantasy+android+controller+support PDF link annotation
    • http://gsemilia.it/userfiles/files/43766698855.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/tatixajefumet.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/96512597116.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/16454827151.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/92804744898.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/15061347829.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/vofaziwatutawanaraxe.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/gepalo.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/90564692244.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/sepejobuzik.pdfIn PDF document text
    • https://chv.vn/userfiles/file/61367979706.pdfIn PDF document text
    • https://bolahijau.com/contents/files/86285839230.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/xebivoxej.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/jusajinirovipov.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/13670213359.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/11865608029.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/93819733059.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/lujexagavirovonidem.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/52954743502.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb5dc2a47---kuwesepinujopurileg.pdfIn PDF document text
    • http://sb-78.ru/files/file/fisedulodituradobikipa.pdfIn PDF document text
    • http://generaldistco.com/images/file/81315654181.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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 10804 bytes
SHA-256: 7dd1d6901232514f03bd5a08b5429b48bf742fb6080e1d5658fa1a7e05192276
font_01_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 17232 bytes
SHA-256: 14257dbbc8ef042a81e34f7c139e4d21633151da78234e5e6f35c1b154a389a9
font_02_sfnt_off00012113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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