Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01cbdd5893e644f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 15:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cc1337d29cafe0c195b9b01b73716dee SHA-1: 30f7921ab17543ba410872c83b178df370808d8a SHA-256: f01cbdd5893e644f52a9490d96a5f38f8e2146f31d87cfaeb102b5976e07f929
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allamericannursing.com/userfiles/file/xofimu.pdf In PDF document text
    • http://sasolution.kr/userfiles/file/bifirijutexufarifof.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/28105183025.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/pununawif.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/kivabozabupifewadudanobo.pdfIn PDF document text
    • https://doitoutdoorz.com/file/nwnRY1Sab2NcJwDn.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/badeg.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/61355993584.pdfIn PDF document text
    • http://donghotam.com/luutru/files/memowos.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/57k38s8mpmgdqrhk63a14fbnik/lazutupidopemagilake.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613837db11508---pefabubobopurixapizireb.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/dekebase.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/nuwupowinowefuvevixi.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/62427388715.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/rimisi.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/42259325281.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210908_90E86FB932A76804.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/ralizebitanoxabupaku.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336dd566da5---9036532463.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/36571202350.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/18541335160.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/57220335862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=game+paling+bagus+untuk+androidPDF 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_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 11104 bytes
SHA-256: 5f4a9c82bbb536b695eb18058c3bc74898527fe62cd0fe582f2f38c712f806ab
font_01_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 18460 bytes
SHA-256: 23d57a5826b0d9ce8500fdfb0c1710b40406e862178539c2d21d20621ce666ee

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