Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdc6dfe5eb92e47…

MALICIOUS

PDF

103.0 KB Created: 2021-02-16 11:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 02c13c764a0dce157be132bad25ffc7b SHA-1: 756cbcaeb92a231814eed7d80a1edf5761b613fb SHA-256: efdc6dfe5eb92e4774b70eb74ba5aea5e0d5c06d4a7df90cdb11c424841301f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://leonvi.ru/strik?utm_term=wordpress+themes+for+freelance+writers', is embedded within the document's content, suggesting a lure to external, potentially malicious, sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=wordpress+themes+for+freelance+writers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5ffeb40a6d9b0.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/jbFjdtJ/killer_bean_unleashed_cheat_app.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/dukokupukawunok-balaxuzofuk.pdfIn PDF document text
    • https://mefanajumajadip.weebly.com/uploads/1/3/1/6/131637152/3872309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375352/normal_5fc9834e1bdb3.pdfIn PDF document text
    • https://gemumumesuligiv.weebly.com/uploads/1/3/4/3/134318519/dimuwifewosibosafi.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/hhAPha3/rixozutole.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/pjfgjfC/lunowaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/mgcgdji/money_machine_2020_trailer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lepefi/videvumakakujezevejosol.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/2679155935.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/computer_background_photo_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/piporanexerideferu.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/carambola_games_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DA 5500 bytes
SHA-256: 84b80fe9d69b505827b7289227388cb1fe82ffdac31d6e65b02174dd7013b3be
font_01_sfnt_off00016b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B7E 10420 bytes
SHA-256: 38605513236ac48e75ad8ff64d4671e3f7aa8e34848af776c53d4c49650b95a0

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