Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81d4d4941e311ae…

MALICIOUS

PDF

80.6 KB Created: 2021-02-26 17:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ab56ced898051e95649962c60fa73232 SHA-1: 90d5443403b81cf6b777c83a3eff8ed4c940d766 SHA-256: e81d4d4941e311ae4475779e3516621bdde8cc8f3eb714d090765b8d391c5d62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a worksheet, which is likely a pretext to trick users into visiting the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=surface+area+of+square+pyramids+and+cones+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477156/normal_5fed94b368fef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_601d33e2908e6.pdfIn PDF document text
    • http://redtea.space/bach_minuet_in_g_minorxit0f.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/mini_dv_camcorders_for_sale_uk.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/jukur_fileberakolizu_galifosulejewub_viburejawulera.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/4f344f8bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_602255d16e951.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/6d180651.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/how_long_do_thermador_appliances_last.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366335/normal_5fc918d22df39.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/Azfhjhi/idle_flipper_unlimited_money_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fd1b99a46189.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/hgd5lie/soromojuvokumipe.pdfIn PDF document text
    • http://lesantyqas.online/traxxas_tqi_link_enabledd7hpo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futikuzita.onlinewebshop.net/6076135978.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/653088248.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://scripts.sil.org/OFLIn 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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 5848 bytes
SHA-256: bdd96421c69820c0c2049ae569269b5681820e8d5d8864683d15f5888ddb764d
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10856 bytes
SHA-256: 0aa0bcf82655f9433baaefba0dee0d072fc2482d5dfd8b640061d7be1caca70e
font_02_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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