Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afbc2f3be0b0646…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 00:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 017c9e0179dd63923d4185f8dfad75ac SHA-1: aa372ec63fb1c313bc6ce9420494de5c6789a92b SHA-256: 0afbc2f3be0b06461296f9d1f9da94f013344eb83366128c8ce70c0dd54efc6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=iphone+style+music+player+for+android PDF link annotation
    • http://hanauhrova.cz/files/xopinidaluw.pdfIn PDF document text
    • http://okun.su/upload/file/69480905378.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/87903266626.pdfIn PDF document text
    • http://machin.kr/userData/board/file/nobemigip.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/1955865792.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/40e7smrnum73f63ncra1d3rk09/purujugarebil.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/38425243399.pdfIn PDF document text
    • http://oilspecchem.com/files/41340255030.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_B68950D521EB8B43.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/36696211400.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/10228898820.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejedunudodapikuf.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pigurod.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/60261881277.pdfIn PDF document text
    • https://denimder.org/resimler/files/sedabujolita.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/pevawumepiwedu.pdfIn PDF document text
    • http://atek-ent.com/upload/file/jinutelewaludasukuj.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/58716916306.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/wijaluzesatul.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/61371449681.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/6195158599.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/11280893269.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/wopoveguresukige.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/66174833048.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/nevokiseguk.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_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 11052 bytes
SHA-256: d1f184e423b618f34e7ff9a3bdf07d4544af0ddef94d83d3664025c1d4457126
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 18432 bytes
SHA-256: 761f92ff165fdd64228b168d5068f60b11b5847a3cabef2abafc393cd2d65b77
font_02_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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