Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf94e1bbe751ccf…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 20:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1038b2c18659fd044df3b1b9b7b877f SHA-1: 3a7ca57679efb4d62340320d90817f53537fa4a7 SHA-256: cbf94e1bbe751ccfdffc6a4ff9dcfe0476beb7cc70b5b938906909df4f1ef128
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://highendschmiede.de/highendfiles/file/pobusexozepivu.pdf In PDF document text
    • https://volnynaklad.cz/data/file/kadadiwew.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/94101527021.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/muvopelipiniparufixuvogip.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/weripebufuwev.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/39682066639.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144731c49cee---95737650310.pdfIn PDF document text
    • http://domuran.pl/files/file/24435876409.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/vowedudabusomomiparete.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/33433132961.pdfIn PDF document text
    • http://vipdiler.ru/files/file/85259353490.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/dewuluwoxifiriba.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/kuraruxe.pdfIn PDF document text
    • https://edusfera.pl/upload/file/vilurinisenox.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/kumekegikivuduwuvimesujez.pdfIn PDF document text
    • http://wsm.hk/images/files/72748798251.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/69904323345.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/vugemojuwozezaxibil.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/62820724577.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/93015262249.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/jilurururugana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nezha+reborn+full+movie+watch+onlinePDF link annotation
    • 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_off0000ac1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1F 15276 bytes
SHA-256: 8ea02b8ffb5dfb674039ebc8b2194c8a3e1765a1ce537487b9c24a261b803b58
font_01_sfnt_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 10864 bytes
SHA-256: 4ef08f5c3ef8833137c7797401ab2e1bfdc6a5a26c9d73f94b62cf997fd110fe
font_02_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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