Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d91dec8afd4223c…

MALICIOUS

PDF

75.8 KB Created: 2021-03-08 19:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8596c615a21759f9460da7adac7fd70f SHA-1: 20f56ad9c895cc6cf57b95ce9c0eaa7bd2a62bc2 SHA-256: 4d91dec8afd4223c3608bc3cbf9da926971354b56f5ed649477c4d731b6c4224
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 PDF files, indicating a link farm designed to attract search engine traffic or trick users into visiting malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the link farm heuristic point to an attempt to redirect users to potentially harmful content.

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 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://pelibifir.ru/award?keyword=sonda+foley+procedimiento+pdf PDF link annotation
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/c21e6454884c9.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/3754834.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/19dd0.pdfIn PDF document text
    • https://sufidubiziden.weebly.com/uploads/1/3/4/7/134732268/c2d8c2132ddb6.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/dexodov.pdfIn PDF document text
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/3592598.pdfIn PDF document text
    • https://bixevojug.weebly.com/uploads/1/3/0/7/130739122/sonuzikosil_lobin.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/27632527247.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/gudukupir/zoxaf.pdfIn PDF document text
    • http://pudosuvosav.atwebpages.com/tuxometi.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_8afeab565a614121b84dc1b79fa0c9af.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_5b905db7bb2b477588c7b5dda3a25fd6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julaxel/34168005070.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_afa38bd20737498291024f8d131a03f2.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_2d660fad9971445fbab60f71bff358c0.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_3407f074f2f34ad4b0a377168376041c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/39335430394.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/romepizanudasevas.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/6697262809.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/9457900460.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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 5328 bytes
SHA-256: 0690ca375e7ec48cb922755ccbe23dbd64d4e363852306256a800dd23621f1d4
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 11664 bytes
SHA-256: 336d82065566325f6fbd48d758ba958ad1919d144aec8080bade671239c5e2db

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