Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cc04749f9d58a5…

MALICIOUS

PDF

80.5 KB Created: 2021-03-22 13:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d7178de5a16253cfbb22d7fb5eb8bd1 SHA-1: 612c7a5ba77438096f92d213111c04dd65ec81ae SHA-256: 92cc04749f9d58a587fc6beee958d6212b654e78096860ad84c59b327798a830
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/award?keyword=substance+abuse+definition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402517/normal_6021faa4e8bda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_603e067ad48da.pdfIn PDF document text
    • https://vesovagesigopek.weebly.com/uploads/1/3/4/6/134614223/retef-zirafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416304/normal_5ffba08949489.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/dabuv-safez.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/momotiwasumerog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_605845a555e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_604b9dcf3c335.pdfIn PDF document text
    • https://nolelagisumo.weebly.com/uploads/1/3/4/1/134132353/zibemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_600dc23865442.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://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_b0d8d082af7642cebf5e6bab9340e6f4.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_a6058ee81e88452ba5c8bbdd31cb77e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/futamo/nufutufutumow.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/update_club_card_safeway.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/19521600607.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/fujaxovimotilovubivi.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/63330543261.pdfIn PDF document text
    • https://b7755ffd-cade-4db9-a3a9-94934e762344.filesusr.com/ugd/f84671_b359f0b1ba0a45339da78b254addb44d.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_7f8ad7fd05e34860bdad302374a906d6.pdf?index=trueIn PDF document text
    • https://c33b9ccd-b51c-4983-b12c-9660feb698e0.filesusr.com/ugd/1fa6dd_98e164853e8f4a8d90550c4dc6d73a27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/sobavixupopodazumegima.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_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 5148 bytes
SHA-256: d4684ad5c885ace8f00169481df776c3f76568758654ad7ab16a5f258d33c06c
font_01_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 10212 bytes
SHA-256: f6b11b7c4741342b07b20a03edef9eb510402bd780d4e095ad06efb9279b8afd
font_02_sfnt_off0001265e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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