Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd0b6b4238956cc…

MALICIOUS

PDF

76.0 KB Created: 2021-02-13 19:25:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9b7dab91fe3c31caa7fbde4dc5ea1ddd SHA-1: fe0f5401f156be337aefa9724561292d4e925fb4 SHA-256: bfd0b6b4238956cc0a092098f62ac81d759dd3bb781103472d39ff96fb7fe4c6
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-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/wix?keyword=saxon+math+3rd+grade+worksheets+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5fc596653ec69.pdfIn PDF document text
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/2327853.pdfIn PDF document text
    • http://gloslides.com/clasificacion_de_las_empresas_turisticas6ld1k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5ff5378f2e7af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386087/normal_5ffff75aafb95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_6012b787a5136.pdfIn PDF document text
    • http://jobs-ingenieur.best/city_gangs_san_andreast67ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458150/normal_6003912df05ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447431/normal_5ff278f9e9f73.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/cBGhKNQ/durak_online_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_601d21977f862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_5feb1b5d66b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6013601c92998.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fodose/vidmate_app_ko_karna_hai.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/red_patent_platform_shoes_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/45694470165.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 5656 bytes
SHA-256: a77efbb8a0344438819f3ecc4ea08d4da197d205b151ee7c76f8117db2206d09
font_01_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 12072 bytes
SHA-256: 69738737d391e0275677e2b9635c4f31e9efb9fbf78e67eaa2a8e2a632461533
font_02_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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