Malicious PDF — malware analysis report

Static analysis result for SHA-256 1871623d53e3f63f…

MALICIOUS

PDF

36.8 KB Created: 2020-06-14 20:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23879ca08917e0e31e0a06485d142b8 SHA-1: efc3f0c1a3de24f4fab7c132f63f44f4350ceb22 SHA-256: 1871623d53e3f63fb1ad9eeb091947fb06d94b37dbbd30e53af67a4c8f461dff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests the document's purpose is to host a large number of external links, likely for SEO manipulation or to serve as a distribution point for further malware. The embedded URLs point to various PDF files on different domains, reinforcing this link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8753931-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8753931-0
  • 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 http://familyheritagegrowth.com/uploads/1/3/0/7/130738725/130738725.html#lake+como+guide
    • http://artac.gallery/uploads/1/3/1/4/131453657/rimesonojud.pdf
    • http://theinterviewwarrior.com/uploads/1/3/0/5/130550971/tekunumiwixi_dapevosub.pdf
    • http://jerseyshorejewelry.com/uploads/1/3/0/7/130738706/fd718c00e78.pdf
    • http://flightacademysdw.org/uploads/1/3/1/4/131407687/ba4b7fbc0.pdf
    • http://craftyourvoice.com/uploads/1/3/1/3/131384484/3300333.pdf
    • http://charlottesvillecohousing.com/uploads/1/3/0/4/130488820/sewezuxenu-zetiden.pdf
    • http://myperfectgem.com/uploads/1/3/0/6/130621345/filose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gamumibas.files.wordpress.com/2020/06/52139314767.pdf
    • https://daborexawuv.files.wordpress.com/2020/06/60790492854.pdf
    • https://besolofebuna.files.wordpress.com/2020/06/tuponorawaluvinibeba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006496.bin
b611e21261d93d874cb8214aff0c33d08fcb2b6817440f926eb6d0ff2d7ef017		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6496 10536 bytes

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