Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7352c303136284…

MALICIOUS

PDF

82.8 KB Created: 2021-02-25 01:04:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 029b1aa45aa6fb0e945ceaf229cc0c4f SHA-1: 1ae74a3290364a0db53031589dc6f6d7da0b0d67 SHA-256: 5d7352c303136284bc23cbefa7105a8ac7ec53799dc8ced31d8a455e8e013fab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, suggesting a link farm or SEO poisoning attempt. One of the primary URLs, 'https://leonvi.ru/123?utm_term=how+to+help+a+child+deal+with+trauma', is presented with a title related to child trauma, likely as a lure. While no scripts were explicitly extracted, the presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to potentially harmful content.

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 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/123?utm_term=how+to+help+a+child+deal+with+trauma PDF link annotation
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/ranulekumose-bawol.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/Pv4Cghv/musicas_romanticas_internacionais_anos_80_90_e_2000.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/pedekokitijuwugin.pdfIn PDF document text
    • https://cdn.sqhk.co/raxipopu/gWgeVZX/givapebemivigofivo.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/gjgchbu/ps4_flying_games.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/JKhbhdz/21783322408.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/how_to_put_ink_in_hp_deskjet_2545.pdfIn PDF document text
    • http://desokore.medianewsonline.com/blood_bowl_death_zone_2.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/tizowodifi/antilogarithm_antilog_table.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/lauryl_glucoside_technical_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/continuous_functions_worksheet_a_13.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/merozinuwiwap.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/carcinogens_in_food.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_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 5188 bytes
SHA-256: 68d8ffe19f3c4eaf411796ee700ba9d8b1d58d60aa9e1cd2b73cf5de28a9d76a
font_01_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 10612 bytes
SHA-256: d9d6dced2d78f335679cfe9f5ad5a0abb377980a96d956a2bfbe657162b749af

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