Malicious PDF — malware analysis report

Static analysis result for SHA-256 513a6c0a7c95170a…

MALICIOUS

PDF

39.6 KB Created: 2020-03-23 02:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c85925b24306f99f50c3c12cea646ba6 SHA-1: 8290aeacadec20465d214eb99dab3e6f0e9cc6b7 SHA-256: 513a6c0a7c95170a454984fe79a3f22d8e27890f9a3b6ce80d20eeb4434d7349
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary purpose appears to be directing users to a vast network of external sites, likely for SEO spam or to host 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://caroleoliverpsychodrama.com/uploads/1/3/1/1/131164122/131164122.html#novelas+literarias+romanticas+cortas
    • http://thevapelounge.co.nz/uploads/1/3/0/6/130621691/1155906.pdf
    • http://www.wixomtowingservice.com/uploads/1/3/0/7/130775775/8100703.pdf
    • http://www.especialpack.com/uploads/1/3/0/2/130292013/rimet_jotuxobipu.pdf
    • http://sacredandsovereign.com/uploads/1/3/0/6/130639076/nusuzozivuwogufozeka.pdf
    • http://www.4cuteparties.com/uploads/1/3/0/4/130488839/9042487.pdf
    • http://sandyland.com/uploads/1/3/0/4/130489467/nexik.pdf
    • http://www.tinfarms.com/uploads/1/3/0/4/130483766/mubido.pdf
    • http://andrewpatersonjr.com/uploads/1/3/0/5/130588349/8669103.pdf
    • http://atleeinvestigates.com/uploads/1/3/0/8/130814902/9270056.pdf
    • http://casarefugiopa.org/uploads/1/3/0/7/130739917/5858833.pdf
    • http://nashvilledrones.com/uploads/1/3/0/6/130639192/8bf529863057b.pdf
    • http://www.homespunmidwifery.com/uploads/1/3/0/5/130543368/4bdcc.pdf
    • http://checkseostatus.com/uploads/1/3/0/8/130874570/tumexijanupul.pdf
    • http://upontheridgefarm.com/uploads/1/3/0/9/130969708/8830228.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_off00007048.bin
a24a12ad6629b6a2ebf9e86b0399223a5810858220ccafb92b05786834f91ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7048 8524 bytes

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