Malicious PDF — malware analysis report

Static analysis result for SHA-256 75477671b89ea2ee…

MALICIOUS

PDF

107.4 KB Created: 2020-06-01 02:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b3cf25f46726be8a27710a7cb139d85 SHA-1: df66f2bf1a0285006e9c7397022b59de1ebdde86 SHA-256: 75477671b89ea2eef66289224d9873a64f48ac9f2002a8d04dde1c1f357bbc6d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. These links likely serve to distribute additional malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

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://lsr3pzn.brdge.org/uploads/1/3/0/7/130776148/130776148.html#janapada+geethegalu+kannada+pdf
    • http://mail.browbeginnings.com/uploads/1/3/0/7/130774979/pibuvelorub.pdf
    • http://roho-bure.com/uploads/1/3/0/2/130287919/d69fdad5626283b.pdf
    • http://timetimeyt.site/uploads/1/3/1/3/131379815/9211347.pdf
    • http://lesliematheos.com/uploads/1/3/0/2/130272344/d7cb0daf9fc.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pepavujewow.files.wordpress.com/2020/05/36944511685.pdf
    • https://suxeniruwip.files.wordpress.com/2020/05/muberupadizusali.pdf
    • https://kipevofi.files.wordpress.com/2020/05/tobafukonitefixasavope.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001698c.bin
cb18ef31d9c68904814fb8b120f7bb43e516752d3c43f45abdb369d314dc9141		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1698C 5556 bytes
font_01_sfnt_off00017cb1.bin
a9e33dc58693909778ad8b77985388dd82a9997c369c742b11a340e982586a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB1 11168 bytes

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