Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b99f54afb29ef77…

MALICIOUS

PDF

73.9 KB Created: 2021-04-06 14:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eb574734a44dce356e32d25af3bd7864 SHA-1: 95631d75e0540ecb7f2b9262db9cf9fc62e255c7 SHA-256: 8b99f54afb29ef77b3a6ca3fb4b19be245367f85d776a2881e8f3822073bcb63
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=stoichiometry+worksheet%2523+1+mole-+mole+calculations PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470020/normal_601d3ae18748d.pdfIn PDF document text
    • http://itgermany.net/43503973748zz7di.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/jdZygjf/kurimokaburopel.pdfIn PDF document text
    • http://thrivewebs.com/939893426427akqt.pdfIn PDF document text
    • http://itslm.fun/download_jre_8866m7.pdfIn PDF document text
    • http://boomua.site/rosenosedemavepi9dzg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_604a7eb42fd34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5ff8ed24aff2e.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/ghicZEx/45652307905.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/ejcBhe0/69909305453.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/leteraxewe/poposawavun.pdfIn PDF document text
    • http://vojevawe.epizy.com/advantages_and_disadvantages_of_transformational_leadership.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/dragalia_halidom_guide.pdfIn PDF document text
    • http://buzuxujov.epizy.com/kobifawikala.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/koxines.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/sql_query_format_in_sql_developer.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_7570484136f6490fb11f4fdff5b4996b.pdf?index=trueIn PDF document text
    • http://podekorutad.rf.gd/sevajepixugejabu.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_897bd3bf556041fb87e9979c1092c053.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_565e667529ce477d876bcca9a6944ed5.pdf?index=trueIn 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_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 5160 bytes
SHA-256: c5cf293ffc0fdaf8ee9ac12f6551e2f01daef5aeb2a3f5ac53800c0a2c92afce
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 10308 bytes
SHA-256: bc23095b526dc46c3e750ffe8fe8f5ee251f55625675fa7757c083c682e25f2a

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