Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1632997fc35e40f…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 11:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 171ea1741009d581a75874379dfcc457 SHA-1: c54be1eb44814cdf9353e3d2c2cfd9080653502b SHA-256: c1632997fc35e40f06264cc9ce121e6dc2f37ddd1f2516d16459e8802a819e00
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://nipisod.ru/123?utm_term=animation+2d++free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5fcf073963c84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fdfd7a6731da.pdfIn PDF document text
    • https://sizazadumaf.weebly.com/uploads/1/3/1/3/131398154/xezomo-zuvomemetamoxu.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/xemejujufusoxu-nomigukaroko-selifobor-zaluwowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404285/normal_60013bad19713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_601f7e0824371.pdfIn PDF document text
    • http://dalkomis.website/qashqai_2020_service_manualthoc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_60319a9080cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5fda3ce1a6c70.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/bunb7gg/25639746381.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/4ijahaS/cfop_oll_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484636/normal_5fe251dc30548.pdfIn PDF document text
    • http://openlait.pro/jomujodujalikdvwx4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473419/normal_6024a1c996ff9.pdfIn PDF document text
    • https://waxatuvew.weebly.com/uploads/1/3/4/3/134371429/wefijevin.pdfIn PDF document text
    • https://tofariviviri.weebly.com/uploads/1/3/4/1/134109347/kawomupakibuj-lejora.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 4964 bytes
SHA-256: 2ceb0684e5ecf46f02cb45c8f3a2c3178f781747c2e3222e3977c98a25eb9652
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10380 bytes
SHA-256: abb457b57886fd77323671b711fe0f6fb404b4c4721507e267cd576b1a0cb0e8

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