Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8efac03db6cef6…

MALICIOUS

PDF

41.1 KB Created: 2020-03-24 05:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f50dee367e258e0cbba39b68485ca455 SHA-1: 5e97fa010f662cab8ea689bc123387ab3b4bfb77 SHA-256: 5e8efac03db6cef61dc739ecd35d4f3b8f413db450315c90ba82b8d60f2d130e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous URLs points towards a content-luring or SEO-based attack. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://kimresine.ca/uploads/1/3/0/7/130738524/130738524.html#hamlet+act+one+scene+1+summary
    • http://rebeccacalisi.com/uploads/1/3/0/6/130639283/4930521.pdf
    • http://petwastecontrol.com/uploads/1/3/0/7/130740259/jinuma-nelatabe.pdf
    • http://charactersheet.org/uploads/1/3/0/3/130313091/eda287c02.pdf
    • http://arty-lab.com/uploads/1/3/0/7/130739173/5c1d473e09a0.pdf
    • http://www.heartminneapolis.com/uploads/1/3/0/6/130622007/3716c86.pdf
    • http://happytales.online/uploads/1/3/0/2/130272859/4742396.pdf
    • http://godsgraceissufficient.org/uploads/1/3/0/6/130604710/5316629.pdf
    • http://thepharmarketeer.com/uploads/1/3/0/4/130489331/daneledidijidokawif.pdf
    • http://www.crystalclearing.com/uploads/1/3/0/6/130620628/2576656.pdf
    • http://www.csdovey.ca/uploads/1/3/0/6/130603985/lowimelufil_miferevinax_zatobolumewe.pdf
    • http://3stonespersonalorganizing.com/uploads/1/3/0/8/130873796/forax.pdf
    • http://5elementsofsucess.com/uploads/1/3/0/6/130621771/5b6f391eeee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007062.bin
31d791d417fe8a4da32537849d5f2065aa764c9340531f7fb3a114cdfa0964f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7062 7756 bytes
font_01_sfnt_off00008e8e.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8E 2652 bytes

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