Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbacb5d9f8f552a…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 13:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d4d3b22a2934528c5872a5d03ea3c27 SHA-1: 99c8f4cfd09e33e43370018aaaa02619ff48dbe3 SHA-256: ccbacb5d9f8f552acf6a673508b4f683bf86c00f48273856b20f8a4a099c2008
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong intent to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=find+my+phone+pro+apk PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0e9246dc0659ae1613ff55f86e41501/37522582146.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/90157040091.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/bixuzaf.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/jixivevuvaxematejuzozili.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/tidikomegugukiko.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/pizaje.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/vojuribuzuzudoxufeb.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/liwulo.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/48313098573.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/buxebe.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/39293626101.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/wukewowemefepu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/94643302027.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/suzop.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zoweluzepimodejabogefo.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/dixotidowoxebox.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/98816124996.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/43820743844.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/52376200274.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ecaf7b268c7d5539f80f793792dab38a/rowexeruwivutidaruv.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/kejekafejidawebevijan.pdfIn PDF document text
    • http://oilspecchem.com/files/69739573995.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_off0000b5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CD 18884 bytes
SHA-256: 5c6f0960731efc3747ab700973d89c54d63302c04a535b3547f832f29c7be293
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 10528 bytes
SHA-256: 2d7500e0109bdd1b830784a2add2414f9a4be797bc3724f67c0759bbfd17645f

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