Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b6e4e1ebe765ab…

MALICIOUS

PDF

77.7 KB Created: 2021-06-02 18:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dfe3dfba54c521555332435c81beeebb SHA-1: 225b75438248fade7af5795481b63542a2c50be1 SHA-256: d9b6e4e1ebe765ab0865dde9e2ae0dc737f2757adf523d674da390b7012a1558
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term=arcgis+basic+tutorial+pdf' in one of the URLs indicates a lure to attract users searching for specific content. No scripts were extracted, but the structure and link farm behavior are indicative of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://infrive.ru/pbw?utm_term=arcgis+basic+tutorial+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462351/normal_6003b76ad241f.pdfIn PDF document text
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/4482845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_603a573430193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_60110508d72bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388428/normal_5fec92431e9bd.pdfIn PDF document text
    • https://kexiwiwimibip.weebly.com/uploads/1/3/1/3/131379584/460ea.pdfIn PDF document text
    • https://gowokijisamupu.weebly.com/uploads/1/3/4/4/134438950/8b62f5823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5ff4c4c9aa03c.pdfIn PDF document text
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/a6df24cf3bb91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_600e26a66ab35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_604eb7f718989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389792/normal_6044768509a80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5ff41130b9934.pdfIn PDF document text
    • https://laripevomed.weebly.com/uploads/1/3/4/2/134266376/6541939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5ff1f54e55adf.pdfIn PDF document text
    • https://sovirolozemeze.weebly.com/uploads/1/3/4/3/134337586/3794996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_60296ea848dd8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4391920/normal_60b38dba61d06.pdfIn PDF document text
    • https://xozojijeb.weebly.com/uploads/1/3/4/4/134436315/7808071.pdfIn PDF document text
    • https://zokaguwozan.weebly.com/uploads/1/3/0/7/130738936/vanaka-relowefikan-waluvow-botukonolara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 5452 bytes
SHA-256: 789860ee2f92680c2bc2c2a60939c50844006a0709db7ab64343cf5250218013
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 10884 bytes
SHA-256: c37abbbaa63e7debc918870a4e0e59e2d0cd5d94dd01629766ded5dfc7e0e948

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