Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ef1dd13c775873…

MALICIOUS

PDF

80.6 KB Created: 2021-02-26 06:39:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 381ae9d6fef159e6eac88648e8505f74 SHA-1: 45af00a4c91be6e95778ec00872c4984ab3db28e SHA-256: b4ef1dd13c775873db9bddfe493826a9c48fca89ca1a637b8ca1c3587946783d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'art of conquest mod apk' and 'wkhtmltopdf', implying a lure for a game mod download that likely leads to malware execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=art+of+conquest+mod+apk PDF link annotation
    • http://winoorama.space/goldman_sachs_blockchain_2020edvy0.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/2adcbb9b36.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/cidhbjc/tizobotipo.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/patab.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/murumuwaxegupa.pdfIn PDF document text
    • http://sovetnik53.ru/81445987756jfvbr.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/61400793204.pdfIn PDF document text
    • https://cdn.sqhk.co/wejuladuke/ticvXjg/wikebugarifulod.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/chamberlain_universal_remote_genie_intellicode.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/medios_de_comunicacion_que_existen_en_el_mundo.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/sivezulupir-javoronipovi-guzakiranapanil.pdfIn PDF document text
    • http://bumomuvo.iblogger.org/karukomovebodepifuxip.pdfIn PDF document text
    • http://hotita.space/marathi_aarti_sangrah_file_freezl9to.pdfIn PDF document text
    • http://bezprovodov.guru/descargar_solid_converter_fulluy3h0.pdfIn PDF document text
    • https://nuzepobijane.weebly.com/uploads/1/3/4/8/134885792/suniser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://puwiliguso.rf.gd/37662882791.pdfIn PDF document text
    • http://purokazurawilew.rf.gd/27566111129.pdfIn PDF document text
    • http://nuluvikubidobo.epizy.com/arcadia_by_tom_stoppard_analysis.pdfIn PDF document text
    • http://rowesotinik.rf.gd/72312981224.pdfIn PDF document text
    • http://vifowas.epizy.com/the_heiress_tagalog_movie_online.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 5284 bytes
SHA-256: 4347448bca2a9e72c78798b6cd31de478186c516e3c75f95862b3b1f3be3b55c
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 12276 bytes
SHA-256: 3bd25e07762ebf20fe8d3343034815b67828d3429544458f60f9a8b0cc34b2b7
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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