Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0bbebba8f3f9c1…

MALICIOUS

PDF

67.0 KB Created: 2021-03-01 04:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f58b0fbdc723e830047e19ce450cb9dc SHA-1: a82b8517af738045bf76f2d99f837d74bf67f48e SHA-256: ca0bbebba8f3f9c1b1762917a387a36c71a7b46f0572e3cf6fa8b6b877454181
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection attack.

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://gimoguvi.ru/strik?utm_term=hp+photosmart+c7280 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371266/normal_5fee342c3781a.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/2fdbf6e56b9d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_60298dc880b98.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/0IZjjhd/gezibusej.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/ViXmyje/streamer_life_simulator_money_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/hifjggh/firiwuselebexu.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/gvii9gc/56006007086.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/gitipelut/display_grid_template_columns.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/22901072405.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/muxovogal.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/kakuwinizup.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/solaris_11_os_iso_image.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/misogafuja.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_off0000c786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 5648 bytes
SHA-256: 4acfd8e9cba0aa744b59dee6937b8ac0251271245c279a3a3986ca3c9cde8e13
font_01_sfnt_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 10848 bytes
SHA-256: 89622daeed94164cabe103bebc06be5eae85f2563d4aa971793715f1ee2857ba

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