Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de13e9b1f52ec3b…

MALICIOUS

PDF

152.2 KB Created: 2021-03-19 08:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 933c59aa0dcb0c6331c120c84d34d5f3 SHA-1: 9a318c2f32513ecd0758b510eefb8aa13882a4dd SHA-256: 2de13e9b1f52ec3ba261fde3eb07effa1c0e295cc99b80d68d792a2a8e5d5be7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain ('midufefew.ru') and containing a 'utm_term' parameter suggesting a lure. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious. The document body, though heavily obfuscated, contains text related to 'Kung fu hustle 2 full movie', likely used as bait to entice clicks on the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9749

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://midufefew.ru/strik?utm_term=kung+fu+hustle+2+full+movie PDF link annotation
    • http://menugejonara.22web.org/13528756836.pdfIn PDF document text
    • http://bixesifebara.iblogger.org/adjektivdeklination_bung.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/declaracion_francesa_de_los_derechos_del_hombre_y_del_ciudadano_1789.pdfIn PDF document text
    • http://puditutado.22web.org/86972393940.pdfIn PDF document text
    • http://reveruverof.medianewsonline.com/samsung_top_load_washer_dc_code_fix.pdfIn PDF document text
    • http://puzuvonomo.iblogger.org/hornady_123_sst_6.5_grendel_load_data.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_b9169d5271f845128a11fc31b2f95795.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1e78cf-9440-4374-bf61-92479bbf5790/fimimobijafedoma.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/apple_logic_system_overload.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/46151497.pdfIn PDF document text
    • http://soreras.epizy.com/xepilez.pdfIn PDF document text
    • http://vidodusiv.epizy.com/administration_manager_duties_and_responsibilities.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/alimentos_transgnicos_en_el_peru.pdfIn PDF document text
    • http://bonizigajivoxi.epizy.com/toro_personal_pace_lawn_mower_parts.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_fcb06d45e4234773bba588a718949c59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lazesej/vedic_astrology_birth_chart_cafe_astrology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf8ecc9-47a3-40fc-bfb0-fdbeaa013bf7/widemekamitapu.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/18917075269.pdfIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_d051476014d24618beacc04c09ccd543.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_a0d991ad7af84576bac0724f7dba3d2f.pdf?index=trueIn PDF document text
    • http://fofiwufawiparug.epizy.com/63947546854.pdfIn PDF document text
    • http://bomajada.epizy.com/dapiduguxowi.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_82343a353df642a7b1942a154f7daf9a.pdf?index=trueIn PDF document text
    • http://vekemelegewimo.atwebpages.com/define_organisational_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/640bee9a-afad-4362-8c3c-2d47422b46fd/24606177529.pdfIn PDF document text
    • http://nasewuji.epizy.com/vatipufedudezimobuvelenus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EB9 43208 bytes
SHA-256: 227f889198ea1fd5e0e7bb7036d2eac975caee1b2e5fe3037b3aa12dfb63511a
font_01_sfnt_off00020312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20312 5036 bytes
SHA-256: 3e252ab0ca2ab1bb1d839c99879eb2f0839d07df634e1a55c8bf751356d9ae52
font_02_sfnt_off00021435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21435 12936 bytes
SHA-256: 73eac676f0671c275313c4f4132ca626dd627d5a6dc7b1c4dd80c5ada81ddf65
font_03_sfnt_off00023d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D80 16060 bytes
SHA-256: 660d05b38fea380e8cc13f4a5a7db764e9bd2a20a73145a73af50c118749f22b

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