Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa9fe055fa5a86c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 21:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20f6ba4e39d2fc5eb58413aa34da0c16 SHA-1: b7682d338438167673399c439cbd2071e43841cf SHA-256: 0fa9fe055fa5a86cfbd7872437317686d0403888ca22d169683b79875e3432a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing infrastructure. The PDF structure and embedded URLs point towards a phishing attack, likely attempting to lure users to download further malicious content or provide sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=all+of+me+basic+chords PDF link annotation
    • http://abwninemile.com/uploads/files/lobixu.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/rejupibakugijubajeruvinil.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/jezogowakotemera.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/71010029882.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/pakowowoxosejanelib.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ce74c656ffc3364049fb752b320aa2c/20473041459.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a083f32c8---70648134507.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kulabujix.pdfIn PDF document text
    • http://teakdeck.pl/files/file/937323653.pdfIn PDF document text
    • http://gabortech.com/admin/file/79122051269.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/faxuvigulazegatemigeras.pdfIn PDF document text
    • http://vejwun.cz/images/wopopixilebizawosupaku.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/83702008385.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/rupujisovafakexib.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/42673889701.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/raremu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/81319394326.pdfIn PDF document text
    • http://hagakure.by/upload/editor/files/zofidagituwodudum.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/42727258754.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/4707371259.pdfIn PDF document text
    • https://faceless.me/userfiles/files/tevagaket.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/konuxiwijakapetufobaxo.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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 17852 bytes
SHA-256: e146b9a34a87ea9c18483c74c235e9750cc834cbad79e163040c05c5b491049b
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10660 bytes
SHA-256: df0941fd7ea5c5d5bdd5814639fa705eb45dfd2a3fc4ccf512307befb3593e52
font_02_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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