Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f728c467298923e…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 00:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8240d5c5fc6c2cd7d250ac87710c8a8f SHA-1: 99534f4ad2d8c5e60644307cbbe9126671df9904 SHA-256: 9f728c467298923ea4bc8b943a35429c9c7086eaabe088db717419d79060f6ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=volume+keeps+going+down+android PDF link annotation
    • http://levne-pohary.cz/UserFiles/File/30056608637.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/srvgj2a7pjcoim0fqgotn147ju/33743309622.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/rujoxuberixob.pdfIn PDF document text
    • http://potlista.com/file/files/zavukatij.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/nidexevav.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zapavokawina.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/34301074914.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/jodoniro.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/5070813072.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/nodejexipabupudoba.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210922_03B650C01B4B1668.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/81911763453.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/mirepujogetojoze.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/befopafufelobi.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/50829981620.pdfIn PDF document text
    • http://babamoleskine.com/files/file/panafuwiloxilu.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/midizi.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/20487202669.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/turixuwiw.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/64098398047.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/49375498540.pdfIn PDF document text
    • https://educhina.mn/editor/files/62710410199.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_off0000b075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 18508 bytes
SHA-256: 68ee2f7fcc6692aa5f306aedf891f22c183aa7a631ebae2f491758b6eafc8ead
font_02_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 10884 bytes
SHA-256: fa79a9570b3d540c82c0e084e74af648477a8311375e875cf1ff5c0f0162d8ce

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