Malicious PDF — malware analysis report

Static analysis result for SHA-256 008d828de357f3a2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 10:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82c61b5131814ac4d6c3b6ae05152834 SHA-1: 63901ad62a0f97b0d9d9675f21ee58ebf4953b82 SHA-256: 008d828de357f3a26eabccffd4548401c490d634ea418dc25dd4d73d7329ea92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, including one pointing to 'chcial.ru', suggesting it's part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is a link farm on disposable hosting, designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=wwe+2k+game+file+download PDF link annotation
    • http://senseoftourism.dk/userfiles/file/5584348403.pdfIn PDF document text
    • http://perksys.com/userfiles/file/vinorul.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/94518098804.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130e56663bb4---tufuwe.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/89822780744.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fugojuwivafutebezerojeleg.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/45974788784.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/46830211322.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/fexadumadujirazubuwagom.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/forani.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/50139894213.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/95548093977.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/80231746156.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/nekozafosifuni.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/58442661760.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/manom.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/35969115131.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/2167972100.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/91153111605.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/tubebowewal.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/nolowok.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/69487435039.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/44453376314.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/91736575488.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_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 18704 bytes
SHA-256: 1bee6883db57c591978f1e2573b2b84212103a1a21e4f0699958d012d9389582
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 10624 bytes
SHA-256: bbb184dbca6e3eb360a7d97e89d0f2390f6e592bbc269108e3b740db75e70b4d

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