Malicious PDF — malware analysis report

Static analysis result for SHA-256 686552b76a4cc503…

MALICIOUS

PDF

68.8 KB Created: 2020-12-19 01:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 44e2f308854fd3b5af03bc68f2fb8874 SHA-1: d08f8f209ad3bc6d0d3e509b1fa5cb091a4475fa SHA-256: 686552b76a4cc503a91cdf2a7afd4b35bb3b9c65982e8718a5b9dfbefe63d030
156 Risk Score

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://traffnew.ru/123?utm_term=nat+pagle+fishing+pole+classic PDF link annotation
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/2931619.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/9120194.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/1947509.pdfIn PDF document text
    • https://lewelekokoje.weebly.com/uploads/1/3/4/3/134333059/4829217.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/nitajosasa/android_activity_intent_filter_action.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/84450695536.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc172dc1452f90b7fe9340e/t/5fcbebbca3bc3d19153d7475/1607199680969/human_life_cycle_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/best_ereader_fors.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/muloluzosezetewimisa.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/53720949537.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5eb64e98326c02082010/1606377143206/everstar_air_conditioner_model_mpm-08cr-bb4.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/76678733673.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/cleanout_plug_wrench_set.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_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 5152 bytes
SHA-256: af37777b2f62e89442629b498d300d745344039e05c22274de17dd94dbc62989
font_01_sfnt_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 10700 bytes
SHA-256: 44b90417d561a7eeebde96d60bcbefd27c8146d5964a786f3b3e77d6a7302f42

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