Malicious PDF — malware analysis report

Static analysis result for SHA-256 81561590756cc64e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 11:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 205f7d969682c8ac0d96a7f3b463a6ed SHA-1: 67c9a6ed2a797510d1eb670e097f905007175ed1 SHA-256: 81561590756cc64e06858dc3d76eb3cb69f18ce041e5737df936b855b8220f84
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 a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=power+vision+channel+malayalam PDF link annotation
    • http://gamax-moto.cz/data/dokumenty/solunamaw.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/86941080958.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/bidezezemujiloribonodu.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/rubebodovuxiratonama.pdfIn PDF document text
    • https://funbugs.ie/files/file/busizuweb.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210903001231.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/jatebaletuzavusuxuwamog.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/18857054494.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/37821216100.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t8p56hrjquqrmi2jag8cnmkc9j/bevisomukazumodit.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/23559758182.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/92083346905.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/sukiverufeguvetoxebomite.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/xovukuwibavapix.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/ruviguduwo.pdfIn PDF document text
    • http://mp-journal.com/media/file/83479395328.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/nokuduluzugojipu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a59905c70c5e22930868ad5257c9a2d6/3820484634.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/85333665248.pdfIn PDF document text
    • http://househouse.it/userfiles/files/mezufomawunotujo.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/12429214649.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/woliwe.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_off0000bfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 10664 bytes
SHA-256: 92f40711e385f51c6204d93a4f577b199b83de556f43c6c9e96dc26ff4b57e37
font_02_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 16212 bytes
SHA-256: 3f99e8ed9b43daddba9631a26a9bd354d05bf6b30a850a8d551af1b638df592e

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