Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d63ba77db1b095…

MALICIOUS

PDF

32.3 KB Created: 2020-05-15 07:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f692f99110daaea26f9acb8a22a350c2 SHA-1: 90f56b6ebdfb238b01d14a0267967f5e3d6b6b3d SHA-256: 54d63ba77db1b095407920d3a22f8d8cf672062b9da42fd8fdb5bd6a0321eb2d
94 Risk Score

Malware Insights

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

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 document body, though partially corrupted, also contains some of these URLs. This suggests the primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the family is unknown.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://spacecreationdesign.com/uploads/1/3/1/8/131855992/131855992.html#trend+analysis+balance+sheet+format
    • http://hearnownola.com/uploads/1/3/1/8/131856177/maxefatugomujukidozo.pdf
    • http://bogolist.com/uploads/1/3/0/6/130604281/tisefavikigu.pdf
    • http://aleetendis.com/uploads/1/3/0/7/130776877/072dad7.pdf
    • http://anjie-karmacreatures.com/uploads/1/3/0/8/130874217/8803fd31a.pdf
    • http://nscrlongisland.com/uploads/1/3/1/3/131383837/zumezarasasibumibem.pdf
    • http://virtuallybusyb.com/uploads/1/3/0/6/130621465/sovitaf.pdf
    • http://tonarscoaching.com/uploads/1/3/1/3/131398059/zotegufubuvadakaja.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_off000055a7.bin
862e559bc2163c68e4685d72048fc33ef1e1746fe4dd84c1055a6aa2e28b6a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55A7 9612 bytes

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