Malicious PDF — malware analysis report

Static analysis result for SHA-256 f871fcc8acf64573…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 08:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45f4869cd11b5c18c879d82c7c96d155 SHA-1: 6cc0fe8bc1b1758c2dd5c8884ca6cf09c7d37092 SHA-256: f871fcc8acf645738af86dd5b876c96350cb95ee0e9db70958aa28dcf05c19d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded links, many pointing to potentially malicious or unknown domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://abimobiliare.pl/pliki/File/jevukonubibizosegus.pdf In PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/17116221484.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/53122706684.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/sukanizobes.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/jiledonakusix.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/rizejunejerogevewixivem.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b1f8b7a6---mebamovigaguxav.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/roxomawi.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/fozulu.pdfIn PDF document text
    • https://subarini.ro/mm/file/32289284648.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/57018627118.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/71567710447.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/93774167054.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/jitugapis.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/zoremogif.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/65157903599.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c71579dd6f---80955951015.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/63891117184.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/45588042221.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bigapubiziwofilivogedu.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/59526479131.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/49901527.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/weterozijepoken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+any+filmPDF 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_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 17388 bytes
SHA-256: 3de2b99c41e7f732dfb7aae2cd498db11c69488d5442bb4e55e3f1d672462655
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 10216 bytes
SHA-256: ce41d983e175effd2f1f73579b9ee0abc0b54b1723f27265d90456365c0ea2a4

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