Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f851519ce176ebb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 17:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d92eb50bafffcb2f3c20d9ef7672fa75 SHA-1: 15bb2f54b25392f8eb3806db76542b98d83852b3 SHA-256: 6f851519ce176ebb00163f38f567523a4779b4a68f75faa46313c00d80cc2751
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the PDF's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=android+1+angry+birds+go PDF link annotation
    • http://bjsddesign.com/filespath/files/20210908235759.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/51402682688.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xotobamitajovexosugagaz.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/69248080343.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/xopigovexowiri.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rologatiwafefowesomu.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xotekusazododu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kenoxilitadabil.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/63002595680.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/goxafibuwitod.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/74353512555.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256e2186d5---fopixubozemadiveta.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kilebabewolora.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/35245220641.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/vezelevab.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/78849250420.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/51686600743.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/62502240238.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109060633223865.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/79157226974.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/44842820344.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/80618886471.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/58375566464.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_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 10436 bytes
SHA-256: f79f18cbfed850510644c75ed538447ff46060b50344e5610d1977cc3bba155c
font_01_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 19180 bytes
SHA-256: d6ca433e819d7204b6ab9523e8cf4f1c24c0d784b1c25832859e2802575ad518
font_02_sfnt_off00011b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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