Malicious PDF — malware analysis report

Static analysis result for SHA-256 f490a23bae563470…

MALICIOUS

PDF

88.3 KB Created: 2020-12-19 00:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b77871a49759dd78468a197107182fff SHA-1: 17057f859e8e8a5114cb66f324123f0c9e67333a SHA-256: f490a23bae563470f72ac195a2e0362cc43060d025d51218906da42779505fbd
214 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=angular+7+formgroup+submitted In PDF document text
    • https://gamorajemusuro.weebly.com/uploads/1/3/4/3/134316050/581403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_5fa6865f887f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f87ba4ea96fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_5fac268a10670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f90524de6789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5fb75f1d0835b.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/3749186.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/faserubafa/beer_bottle_cap_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/debijasiditel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf513e18e72e5fdbce4f7b/1606373696198/judge_jodi_thomas_golf_outing.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d88868612547ed7fee2a/t/5fd0e716337d9179bd5a8f56/1607526166742/mawuxirofuputaven.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/20213748740.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5be32116eb00e3c6d2e31/t/5fcdccac978da30c561e7d81/1607322797295/75418975434.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf68723d7784041093dffd/t/5fd6f2e6de5b1220c03fc079/1607922408038/pefuzove.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf5d47acac6192a86052c/1606284757127/how_to_add_and_subtract_cells_in_google_sheets.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001201e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1201E 29188 bytes
SHA-256: 5b2ec4f7c258af65e3429ca5513f9d95e78adbd46fa43a945fe4bcf039329d34
font_00_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 5568 bytes
SHA-256: cba686ace8ddf515069cd15b7bca63ae79e067fe86505549a772cf88beb49357
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 11288 bytes
SHA-256: dcd56855fde8dcc9a41d49b8c2fd1800c9af7f18b7b66ee7ebd79634ebea45ca

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