Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a6fc509ed4fd07…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 02:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7aa10782b199d84b7e58773ac8412d7b SHA-1: 5198df498a1dd89311543ab0531b618bf503bec6 SHA-256: 47a6fc509ed4fd07ba79559f3a1b4de71bf24d8b0bf74c0896902b3d327d6408
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with high confidence. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=airxonix+game+android PDF link annotation
    • http://canoeing.by/pics/files/morubifut.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/81260751150.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/bgjtnnpm9u0fb3qkmbk15m1q26/64084798485.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vezadibatina.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zaxowo.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/60003672660.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/4146649.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/57941140072.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/19912357462.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/mamogiteji.pdfIn PDF document text
    • http://neteyes.eu/editor_up/sapikeruwoboriro.pdfIn PDF document text
    • http://modern-pro.ru/files/file/lopoxopugupavugelofak.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/xagepuxatuk.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/15778995296.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/57557495265.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b4e81b89---genizolub.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/70712145774.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/68644010497.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/lazewu.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/ruwive.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/xejekosete.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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 17024 bytes
SHA-256: c39f649cf3844ed2e96c0b26ef7606de0ddec825f5d6df35922b6d836a108ee0
font_01_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F58 10360 bytes
SHA-256: 6654c53c49270647177fdbb07387a80d5ec8bdb41a54dfffaf3a39349d004190

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