Malicious PDF — malware analysis report

Static analysis result for SHA-256 255356d5efd99ba5…

MALICIOUS

PDF

63.0 KB Created: 2020-12-04 11:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c84529b54aa09ad5dc7c38848f30125a SHA-1: dced6a164f4daa9f61fbf70580badbc32819dc6a SHA-256: 255356d5efd99ba5bd301b2ec4c0c39cd28666641843982592edef15cea1da31
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 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.
  • 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://ggtraff.ru/strik?utm_term=stafford+baseball+league+facebook In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5fa1f3e98331e.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/8786706.pdfIn PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/kotakimejobov-nupipuraxupa-lekupokemimomo.pdfIn PDF document text
    • https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/0fb203284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403120/normal_5fc47bd144c4c.pdfIn PDF document text
    • https://puzagetidorijes.weebly.com/uploads/1/3/4/4/134495880/nixilojukakox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5f9158886b9c9.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/3382533.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/7e0a8b867535a.pdfIn PDF document text
    • https://neliwoxe.weebly.com/uploads/1/3/4/8/134871618/766081.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/fukafu.pdfIn PDF document text
    • http://www.staffordbaseball.org/ShowIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fbffe61bf71053ccb0b2b06/t/5fc3bd7ccb3e0f5771c23112/1606663550076/92429761233.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2D 5224 bytes
SHA-256: 2bd873829fa99d6167152ee70007aff31b696e08df0251795b6d6f80ab09a92d
font_01_sfnt_off0000bf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF09 10188 bytes
SHA-256: 9da7717af6a2038678e4ad6fa0b37754cefa654bfe0f40c0bca1b2a324748df6
font_02_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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