Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a179763ce01e68…

MALICIOUS

PDF

40.7 KB Created: 2020-04-07 23:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 959cc260619137ccd9e983fc72b0f889 SHA-1: bfd671b5e6f0341ea1a2a799508ed2a08c413de1 SHA-256: 87a179763ce01e68ca2c8f14c16771e24b360f98f8765e5b03354f5fd20300e0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

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 document body, though heavily obfuscated, contains some of the same URLs, suggesting an attempt to direct users to these external resources. This pattern is consistent with SEO poisoning or a link farm used to distribute 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://janeyogaweb.com/uploads/1/3/0/6/130605240/130605240.html#history+and+tradition+of+jazz+pdf PDF link annotation
    • http://graffitigreek.com/uploads/1/3/0/2/130288488/6496102.pdfIn PDF document text
    • http://habitbooking.com/uploads/1/3/1/4/131409385/1142162.pdfIn PDF document text
    • http://burzykowski.net/uploads/1/3/0/6/130603982/8162616.pdfIn PDF document text
    • http://motoinspektor.com/uploads/1/3/0/8/130814441/bupopuge-pifevexu-jusufifopi-wexelapowidut.pdfIn PDF document text
    • http://the-boat-online.com/uploads/1/3/0/3/130379461/439854.pdfIn PDF document text
    • http://westernnlclimbing.com/uploads/1/3/1/3/131380969/bowujigiri.pdfIn PDF document text
    • http://www.martiescatering.com/uploads/1/3/0/5/130551416/dbddecb272a5.pdfIn PDF document text
    • http://cytogistic.com/uploads/1/3/0/8/130814343/zujalukoguduteba.pdfIn PDF document text
    • http://loverstone.com/uploads/1/3/0/6/130621315/sexokotexegeninu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7426 8344 bytes
SHA-256: 97956b953f389cb50ad3a16e8e982bd49960dd430401049d87471fa6404d18bf

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