Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f9d681acd5e4ed…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 05:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5170c71b341959c27efced029ad3aedb SHA-1: 246c701b2a8571e42a81f83827442e2629cb31d0 SHA-256: f0f9d681acd5e4ed616317346a2f21ca980b8f7f6ddf7a393c1c8ab701918c6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed as a link farm. While no scripts were explicitly extracted, the PDF structure itself can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=forged+camera+apk PDF link annotation
    • https://ristovski.mk/public_html/upload/userfiles/file/38910707115.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/vawamofotojevavavobatifep.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/85548241274.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/55085109928.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/30764081999.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/kodupizapina.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/31851845221.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc7216cae---9438770908.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/lifozule.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///sefugesoveposurokominede.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/sudebedejuditaze.pdfIn PDF document text
    • https://onlinendttraining.com/files/28589419298.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/vupidelofuferudugatere.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c93f56ccfb---bedutiriguxefutokedowasar.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/58853581308.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/59834651628.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/zujinig.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/rukalulamoboda.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nesemadasobiwulo.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/34891067165.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/fifesirajixovikegi.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_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 17644 bytes
SHA-256: c8b0159d4f33538d51917a28736249fa9a8ddc58517c54bdc6c584eb41edc011
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10416 bytes
SHA-256: 9911a53d1e1037688a89f1b666bc84377bb41f23e1e3aaad237908b30efdb986
font_02_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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