Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf287dece2fb110c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-24 06:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 032db36b2e2ef8da07ffd5e1c8c88813 SHA-1: 89d04a7f1023da274c018e4cfc6bf785a2ecd6e5 SHA-256: cf287dece2fb110c4cf8e3762fad208894cc31e3d39cf7f0858b93b7380bfeb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=neighbours+from+hell+ios PDF link annotation
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/kv8q76jqbgdgjr9e8fhfsnk4d4/zotovalomevuw.pdfIn PDF document text
    • https://lordoptika.hu/files/files/judiroxoneseruzunijajege.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/85572874360.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/51345465293.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/88058737765.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/nafefenotetalafabi.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/wenidozurobojag.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/15748535820.pdfIn PDF document text
    • http://gabortech.com/admin/file/pupezepibe.pdfIn PDF document text
    • http://chineseclothingonline.net/File/30500321141.pdfIn PDF document text
    • http://dsfly.com/uploads/files/piwime.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/xunal.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210907033542.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/86771057718.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/99380700201.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/liweviwixawoxujixilobiwen.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/26352857768.pdfIn PDF document text
    • https://thehouseproduction.net/file/32208012834.pdfIn PDF document text
    • http://hklh.vip/data/attachment/file/20015123176.pdfIn PDF document text
    • https://bloomeng.com/uploads/xaxebonegusite.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/17251479088.pdfIn PDF document text
    • https://melz-feu.ru/upload/xekoxaxiwaxevujuvo.pdfIn PDF document text
    • http://surausa.com/uploads/files/73573424591.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/wemilasuj.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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 18756 bytes
SHA-256: 33663e618590807307195d186281ed2b301fa2e60bf7c22d7f1303653f9e1703
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 10512 bytes
SHA-256: 4f02b9a4e90fe4063eb50778abd4c7bc1e64f26d56bf417f3345eff7f6e7d109

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