Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0eb5c86f47d8fb…

MALICIOUS

PDF

38.3 KB Created: 2020-03-29 12:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7b6f82e60f04c5f9278887db8586c27 SHA-1: 5b2c384ebc0f35fc96c572c112e63cadaf6ad0e0 SHA-256: 5c0eb5c86f47d8fba07ccd6d03ecb30282da3816d2212b864fc5819402b89e46
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, contains a URL that points to one of these external PDFs, suggesting a coordinated effort to redirect users to potentially malicious content.

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://juliejesternewman.com/uploads/1/3/0/7/130738939/130738939.html#carta+de+despedida+del+colegio+primaria
    • http://canadabannerstands.com/uploads/1/3/0/5/130547515/4708595.pdf
    • http://technadts.com/uploads/1/3/0/5/130588937/barog.pdf
    • http://adzbuys.com/uploads/1/3/0/8/130874563/giviro.pdf
    • http://adentaitalia.com/uploads/1/3/0/5/130538859/salibifibewaka_gugebezuvib_melaranu_senog.pdf
    • http://flgolfacademy.com/uploads/1/3/0/7/130775169/patalame.pdf
    • http://thongcam.net/uploads/1/3/0/5/130543059/4321923.pdf
    • http://andrewmiesse.com/uploads/1/3/0/6/130604977/14d6547.pdf
    • http://safeandtrained.org/uploads/1/3/0/4/130483903/velata-gakarozepuja-wokekumisemuf-finamovilerod.pdf
    • http://keydistributorskc.com/uploads/1/3/0/6/130621312/duwisubijaxinidupase.pdf
    • http://ljrmi.com/uploads/1/3/0/4/130489418/1723217.pdf
    • http://slayedbytiff.com/uploads/1/3/0/8/130813646/896960.pdf
    • http://6106829.xyz/uploads/1/3/0/6/130621500/nibozukesiwo-pevuno-zuwixodeferiruz.pdf
    • http://afcsantacruz.com/uploads/1/3/0/5/130538981/8216360.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_off00006a15.bin
1854bf1e3d2ea64f79f3c47015f46f3c46858c45aab8dd747a50118d5c57b10a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A15 8948 bytes

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