Malicious PDF — malware analysis report

Static analysis result for SHA-256 729224435c4ac76e…

MALICIOUS

PDF

70.0 KB Created: 2021-02-24 13:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 25e8bb0783c9c49a1b59d2079b5dc393 SHA-1: 97016a30811cc9875f905df12de07bd1854195f9 SHA-256: 729224435c4ac76e3141de4312f29dff2bfdd40342ad9b89ab5d5feb8ad78bc1
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://druttle.ru/wix?keyword=temprid+sc+vs+fx PDF link annotation
    • http://3gusevshop.space/85595460559ujvnf.pdfIn PDF document text
    • https://xirixutikudu.weebly.com/uploads/1/3/4/8/134873033/5de119b98ee38df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5fea0b4ec8fb0.pdfIn PDF document text
    • http://quickpapp.online/37310663072vt9sd.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/6790167.pdfIn PDF document text
    • https://pejejuwefosewa.weebly.com/uploads/1/3/4/0/134040570/b408c64efff3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5ff894d423b24.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/bapuxig-tivitapajon-sizatexevoko-fibitutitipoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_60156539aab2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_6018e35e701c6.pdfIn PDF document text
    • http://organize.shop/adjetivos_posesivos_pospuestos_ejerciciosao4l4.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/jusagi/open_broadcaster_software_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/laxaki.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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 5136 bytes
SHA-256: aa848939d8b082fe92782b7626002abd359de5ba535f6a64636baffc8e84f2c2
font_01_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 10784 bytes
SHA-256: 1324469c6d40ae67026855acd119adfc70e349b44a72a573bf0b8a2142f2b7c6

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