Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd22a29d8ee5dba5…

MALICIOUS

PDF

63.9 KB Created: 2020-11-29 06:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e6edf2b9c17080f99db319823df92b33 SHA-1: d74345059bec7394dd9ae292f9fa0bc9cefb3e85 SHA-256: dd22a29d8ee5dba5a250f2a2ca8d6b291e733d639721fa38bd3ece210bfc6b16
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 0.9998

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://traffking.ru/123?utm_term=ultimate+frisbee+unit+plan+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487626/normal_5fb5a105bdbcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5fafc0390fc57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_5fb807f7574ab.pdfIn PDF document text
    • https://tojuseviru.weebly.com/uploads/1/3/4/5/134513446/017b4.pdfIn PDF document text
    • https://janonezofeto.weebly.com/uploads/1/3/4/6/134664798/7685aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fbec385d825c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5fa89e5e3d32a.pdfIn PDF document text
    • https://datojulimiwijo.weebly.com/uploads/1/3/4/7/134708787/1043345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_5f98031227750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_5f99f00644533.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/jotizifime/frases_para_musicos.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/74984618942.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/wukipuberob.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/barron_s_sat_biology_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/64274551343.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_off0000bd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8D 5560 bytes
SHA-256: a360b7b8bc79fb7df88f1243fdfc282ab6eb38326f946b094fed0af498e31992
font_01_sfnt_off0000d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 10052 bytes
SHA-256: 241cbb67e9a32f9f73c3a377df1af9366c60185d9046d1bf0d3ed560bdad8ce3

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