Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f77459ae00be8ec…

MALICIOUS

PDF

91.6 KB Created: 2021-03-10 04:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2415ae0978e2d41ddca1ff47250e7519 SHA-1: 2ef366d74cacc39cda22d5edb64de8f53ec0c2bb SHA-256: 2f77459ae00be8ec3091de079cf60320b030dc3c7fa9b40f3da8f8ee4e632260
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are flagged as potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, contains text related to 'Civil engineering training reports' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the links.

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 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://vilenefex.ru/123?utm_term=civil+engineering+training+reports PDF link annotation
    • http://noliwotobomog.22web.org/67971108780.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/crieiXY/25116284720.pdfIn PDF document text
    • http://biomaniix.website/raju_bhai_movie_hd_video_songsw6seo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478688/normal_6009aad32ad08.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/BMDmtjc/cash_money_application_download.pdfIn PDF document text
    • http://rodsfish.club/soluxogotosasaxezipovds4v.pdfIn PDF document text
    • http://1offpark.xyz/gravel_road_design_canadathpxf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474998/normal_5feb84ec6721e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5fee95c30a9b4.pdfIn PDF document text
    • http://xatubaxo.iblogger.org/92899660972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383918/normal_5ffe01b9933a1.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
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_59a47b7c2c284d0d95b1eb3f98e535db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/dlink_320l_firmware_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/vuwokurutikovolon.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/90480336228.pdfIn PDF document text
    • http://najizomixa.rf.gd/52040350629.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_3e70b98c250044508ab515fdea5a595a.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_d5ea9fdd812247adbda89ac85c958ce9.pdf?index=trueIn 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_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 4856 bytes
SHA-256: 95763ba91d4a977ea8983be37f9af46ef0fd54686a66db0d267cc0824c9261ec
font_01_sfnt_off00012d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7D 11160 bytes
SHA-256: ee8dde65bf5983f396d2ae801262d42f60c6bd3ee912ce2d7c499f7a8958a056
font_02_sfnt_off0001532a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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