Malicious PDF — malware analysis report

Static analysis result for SHA-256 b929db4495f05b77…

MALICIOUS

PDF

58.2 KB Created: 2020-12-11 08:23:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8e67d099fb7ea44bc6238fd1db501c90 SHA-1: 911069fdab8c2639e3b0bea87cad0b2a3bee2dc0 SHA-256: b929db4495f05b77b8d9f970595861c5431d11061684e6456b502f893742d524
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 0.9994

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://traffnew.ru/123?utm_term=father%2527s+day+sermon+scriptures PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f8c74e592102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f90f49f46dea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_5fbca9b76ee6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_5fa64bdc23bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5fc1cedb159ed.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/4ac2b7dadf523.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe17f83570fb44d1cb5e55/1606293498193/tefawinepovojinukudet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6ba65147b148042bc07c/1606380457015/suguzeg.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc542b340f1034a5cc58eb1/t/5fc69000fa04221c710521ac/1606848513382/magic_tiles_3_game_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/comprehension_worksheets_grade_5_printable.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_off0000a9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E9 5372 bytes
SHA-256: 04bbcf7e70c8b545eb9d22e219b63ac4502289fac4effb36b48c41f409d7fc14
font_01_sfnt_off0000bc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC16 9460 bytes
SHA-256: 3574d6ac616f51d66deae7535c38bad8787572f12fb0f38ce97d1a42d8f65285