Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9fd872d09fc3a8…

MALICIOUS

PDF

69.6 KB Created: 2020-11-19 03:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b886f04aabc85455ea0cf5e819585747 SHA-1: d8b5fe5dffe6cc072e04450b0650c0daedf4b850 SHA-256: 0d9fd872d09fc3a89dc83b64845a8241adc30f0029f4b46d1692caa8e03d39bc
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 0.9997

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://trafftec.ru/123?utm_term=funciones+del+lenguaje+ejemplos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f87559db42dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5f97135686c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5f924b874df4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5fa2361daea63.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/3308637.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/tonoxus-wujuwirozugi.pdfIn PDF document text
    • https://xojajadajopun.weebly.com/uploads/1/3/4/6/134646320/guvizubadetabiv-xazeja-vatavidakevu-joweruzub.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/jedaxopopuko/xagavawime.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/worksheets_on_trigonometry_graphs_algebra-2.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/microsoft_biztalk_server_licensing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/aashto_standard_specifications_for_highway_bridges_17th_edition.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_off0000c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44B 5128 bytes
SHA-256: ad4d63a0b7e85f5b7c908d351d0bdef290c9e0ade64a3bdf38b602d07f0bb7fc
font_01_sfnt_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 11208 bytes
SHA-256: a0d4e91cf4ae7439082acf57345c9b1f121a46c69f3afe39bdb60284b3b75ee8
font_02_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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