Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77f9b743ddbd6c6…

MALICIOUS

PDF

85.7 KB Created: 2021-03-11 23:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 00f94e9f41493629b4b23734571a90cf SHA-1: 9fc62d976953a8e5c6d481a045ef4f737444a158 SHA-256: c77f9b743ddbd6c635ac91d9d0065dbcba0e6fca37c62038052d587440b24d35
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains metadata related to PDF generation and keywords that align with the detected link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/award?keyword=aula+internacional+1+nueva+edicion+pdf+descargar PDF link annotation
    • https://cdn.sqhk.co/terasovo/hIgHFdQ/rorigepopavazonobiwono.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxaletadi/0iieRQT/zusifuluwisekixolasu.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/gKCyje9/8930502110.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/CCbMwid/19502117412.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/bXahMjf/crime_cop_car_chase_mission.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5ffdf104b5ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60152d3e4bf63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_f608845ca05e4e7682f6c75001b57668.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_74396d948c1147dbaea38baf4d67fe11.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_90894c81267741ef812a230aa652fc79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/avdhesh_premi_ke_gana_video.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_e7a7f635f77e40b0ae2176dae3ef41d8.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_dd3a85c0350c4080a0e901c54473903f.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_f00b0fc8d65540cc87b1b0cd9326f6b8.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_96a9c153bea1420db46f057bf0a91633.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/c_compiler_for_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/eq2_dungeon_leveling_guide.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_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 5424 bytes
SHA-256: 42002b0ee14fee200a450aa34c36ae7c27a9e7d0c5c3daa55f7275114552bc9c
font_01_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 17776 bytes
SHA-256: 351b2ee72d3745e0e717010c22d95bcaa28117648e6410199f8130530af30a54

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