Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03af6c814297d2d…

MALICIOUS

PDF

39.7 KB Created: 2020-04-22 07:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c61f40be49350fe8c47d67f88fef1335 SHA-1: 97c3c05ed4568daba32d0ecb85b971183f360ddd SHA-256: d03af6c814297d2d33f242526d4c9b14ad64eed6c291d6b1f2842e0d65a4ac43
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF files with numeric or generic slugs, indicative of a link farm or SEO spam operation. The document body text, though partially corrupted, includes 'Kisah lengkap ashabul kahfi pdf' and metadata suggesting it was generated by wkhtmltopdf, further supporting the lure of a document that redirects to external content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 4

  • 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.
  • 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://sanamthakur.com/uploads/1/3/1/3/131381369/131381369.html#kisah+lengkap+ashabul+kahfi+pdf
    • http://globalafricancreates.com/uploads/1/3/0/2/130288762/sorufixalujabapujunu.pdf
    • http://nivafoundation.com/uploads/1/3/0/9/130969506/6602984.pdf
    • http://portmoodyacupuncture.com/uploads/1/3/0/8/130873914/35f4e495.pdf
    • http://educationallyyours.website/uploads/1/3/0/3/130324288/638574.pdf
    • http://tcuroxo.com/uploads/1/3/0/6/130604958/5911325.pdf
    • http://fulltimefreedom.net/uploads/1/3/0/4/130483305/labanemirek_nikapofajetitel.pdf
    • http://crcmm.org/uploads/1/3/1/4/131408008/4400303.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072bf.bin
c2e5dc53e82cfb2efcd436afc98edcdfb586de02998d52c42e6b1b914c362b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BF 8384 bytes

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