Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a67f98dde4be9e…

MALICIOUS

PDF

69.2 KB Created: 2021-06-12 14:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b40799872f6524265f21153b57f4d757 SHA-1: 3f4b61df794bcc939545b788148e38a2cfe8ec4a SHA-256: 19a67f98dde4be9e7adae6718bd2e13dc02f8b59f4ba6ece93f285d8e16116d3
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://botokaw.ru/123?utm_term=bittorrent++for+windows+vista PDF link annotation
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/4149220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_600e070c1cd08.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/1758456.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4377414/normal_60b65c3adbf84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_603ad6a9bf11b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_6056e46ee436e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4409818/normal_60b4ec65e1482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_5ffc55b1292a6.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/xikipu_zapupovosemazu_palalotu_mugapil.pdfIn PDF document text
    • https://xokojitijuxup.weebly.com/uploads/1/3/4/3/134362284/zetomedobapegoneko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_606ccabf9f467.pdfIn PDF document text
    • https://ratanamiwul.weebly.com/uploads/1/3/4/3/134327333/boseloxo.pdfIn PDF document text
    • https://tasoxagizuj.weebly.com/uploads/1/3/4/7/134734804/b353dc99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469827/normal_5ff667a4b80c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liguduper.pbworks.com/w/file/fetch/144451782/63334819624.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/f/70922980646.pdfIn PDF document text
    • http://tekitejug.pbworks.com/f/how_to_treat_acute_respiratory_distress_syndrome.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/w/file/fetch/144426384/futod.pdfIn PDF document text
    • http://vuxoris.pbworks.com/w/file/fetch/144793023/49311471420.pdfIn PDF document text
    • http://motekus.pbworks.com/f/60134496897.pdfIn PDF document text
    • http://pesivop.pbworks.com/w/file/fetch/144875814/cloud_games_hacked__500__0.30__1.40__Low__1.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_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 5068 bytes
SHA-256: 81843c42297d9c6993d4c36eb6fcbfe44315441442f4601d1bef202426f55a8d
font_01_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 9744 bytes
SHA-256: a8fa00ff69830738ebec460c74133192638ad5c07bf61991fd9d6c7bb1329b38

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