Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f01515a86893c2c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 00:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef0e2f2d1ca055ee61980e235aa62855 SHA-1: 1164832a55f53eadc80bfb51f0e622c119b7dc81 SHA-256: 4f01515a86893c2c81b512fdc555887bbe876b35d05f64110d933ab77b7e4d01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The embedded links, such as https://laborke.ru/uplcv?utm_term=samsung+galaxy+ace+plus+display+size, suggest an attempt to redirect users to potentially malicious websites. The presence of PDF-specific heuristics further supports its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=samsung+galaxy+ace+plus+display+size PDF link annotation
    • http://www.como-grup.ro/fisiere/file/89818096153.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/pifamu.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/43963781802.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/85292346727.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jumejizop.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/kumevodekazexejapadexu.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/nuzewa.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/57346814370.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/61aca686f4f6dfa99652e61e07a32b56/nifivoserer.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/nimepivisevi.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/kiguwusogomubopi.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/90391919232.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/5351009303.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/besusixewadumuselolod.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/52032274836.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210909_6C1F8AFDBC02499E.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142840f6bf5b---bisekowovonis.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/soditizevotatepobaxe.pdfIn PDF document text
    • https://goodline.by/userfiles/file/kafisorusedomex.pdfIn PDF document text
    • http://iknow.pl/files/file/wuvepekokezok.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1dab43d4c47907b1bb0338bf6ceee346/8199199118.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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 10992 bytes
SHA-256: 9a6589f657c0ba6c2f514beab0a0aee3dc210b7d6251ede403e4f87f91b79863
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 19820 bytes
SHA-256: 48fe2fd094c7f0f29cb4f97e33610fad706ee17a526665ddaf2e926fd24db43e
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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