Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8bc4a0eeba2346…

MALICIOUS

PDF

60.9 KB Created: 2020-04-01 14:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef43e3d577e64167794bbf8c0315376a SHA-1: b364ea579521e119696a87e5a2b3b490998f60f4 SHA-256: fc8bc4a0eeba2346f34b69bef56583f9e278e2f2a0f198c576fe15352d039b79
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, includes a URL that matches one of the extracted links. This suggests the document's primary purpose is to redirect users to a network of external sites, likely for SEO manipulation or to serve further 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://ttthardstyle.com/uploads/1/3/0/5/130539022/130539022.html#problemas+resueltos+teorema+de+bernoulli
    • http://smallbeginningsfamilyfarm.com/uploads/1/3/0/6/130620887/jelasujagamulimuvu.pdf
    • http://leecanale.com/uploads/1/3/0/2/130287866/texesugadarexo_womozawoj_revada.pdf
    • http://controllership101.net/uploads/1/3/0/3/130324207/7333131.pdf
    • http://novifrontdesk.com/uploads/1/3/0/5/130551726/pilolafus.pdf
    • http://koalaphone.net/uploads/1/3/1/4/131437145/0a4eba.pdf
    • http://redthreadtraveler.com/uploads/1/3/0/5/130588865/zukoju.pdf
    • http://flippintx.com/uploads/1/3/0/4/130476390/laxutadox.pdf
    • http://hvacexpertsmarion.com/uploads/1/3/0/5/130588913/sowefeta.pdf
    • http://reddenlaw.com/uploads/1/3/0/7/130740316/vizikerizuw-sipesedarizelan-xawisuvugemeta.pdf
    • http://themindfulchristian.net/uploads/1/3/1/3/131378774/79cd04.pdf
    • http://cowboys4heroes.org/uploads/1/3/0/9/130969895/7cc62f45fbc.pdf
    • http://coinoplaundryparts.com/uploads/1/3/0/9/130969971/a3d7daa094fbc1.pdf
    • http://pagesdale.com/uploads/1/3/0/7/130740330/sivetova_xizafogelad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a027.bin
2c633f099f53219fa2848c98be4adeef9cfd90e3f609f16a86139061f495fb61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA027 9588 bytes
font_01_sfnt_off0000c2e5.bin
74c05a679d5fa2047ada106b75e9b6f991b038ec1a735e11cca1c24a37bf8e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E5 3276 bytes
font_02_sfnt_off0000ce61.bin
f10aa842a721e941b397e31f88d6812fa2fc2f425c141f5d2adf917814f021cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 16120 bytes

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