Malicious PDF — malware analysis report

Static analysis result for SHA-256 d808afa0044f3c7e…

MALICIOUS

PDF

66.8 KB Created: 2021-01-18 13:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bf1eef769d2875abd875954c210fce62 SHA-1: 326b7b63ecb5bf22724cba2c377bb30e98b96ef4 SHA-256: d808afa0044f3c7e445dd8929bb11bdae0b120cab74cef6b8aa7e58e67fcff9a
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 pointing to other PDFs, suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://leonvi.ru/123?utm_term=principles+of+dynamics+greenwood+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421051/normal_5fed76a0d041c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f94b511716a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5f9b8d8996ee9.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/nunuwovuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f8d1df77eefb.pdfIn PDF document text
    • https://todegebonuvakef.weebly.com/uploads/1/3/1/6/131606144/zawidijonap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f890ff67892e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_5fd1a4e737fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_5fe642c7214fb.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/fuwuzerijofa/google_feud_answers_marie.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/fomiwowagudaguwomifax.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/4540352171.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/android_studio_linux_install_location.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/can_you_find_deleted_text_messages_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/52276603068.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/esc_guideline_2018_stemi.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/ziwov.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_off0000c544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 5672 bytes
SHA-256: a2996ec1cc65960e8100123298e1d2d1b9dd02a8c7206114ad0196d5ef33e264
font_01_sfnt_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 11020 bytes
SHA-256: d67306aa317ad59e080f1ec99e3a8bda62ec077eb287fd00b06636a58c2727eb

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