Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35162980ef6758e…

MALICIOUS

PDF

34.3 KB Created: 2020-06-14 15:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7550ea95ffeabdfc99673e788bf8580 SHA-1: 1dcc5032b4777347774bed56cbc48b2df4ea037d SHA-256: d35162980ef6758eee9e2ca657a8a9d48935e6a23d729394948cb1a1ad22e2a9
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs point to various domains, suggesting a coordinated effort to distribute content or redirect users. The document body itself contains some of these URLs, reinforcing the link farm nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://herboost.com/uploads/1/3/0/6/130621384/130621384.html#simpleshare+nas+manual
    • http://mx.juliesenf.com/uploads/1/3/0/7/130775388/2193682.pdf
    • http://ambervallier.com/uploads/1/3/1/8/131856052/nemukad.pdf
    • http://anderson-missions.com/uploads/1/3/0/2/130287989/safiwuxemekov.pdf
    • http://imgfil.com/1aepht
    • https://detomanuz.files.wordpress.com/2020/06/37782220391.pdf
    • https://xadalirubif.files.wordpress.com/2020/06/6005784236.pdf
    • https://tijitote.files.wordpress.com/2020/06/peputunidafupexoxiwiveze.pdf
    • https://wabuvodulix.files.wordpress.com/2020/06/biwejokulanasamedalire.pdf
    • https://goserogupuxe.files.wordpress.com/2020/06/98696830250.pdf
    • https://nakaviditane.files.wordpress.com/2020/06/62434924561.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_off00005a2a.bin
694e8ea45aa30241b0faa3e23894c29a1ab52c087a7391c5928bce2d37bb126b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2A 10700 bytes

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