Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a91abf0c547312…

MALICIOUS

PDF

36.4 KB Created: 2020-06-01 23:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce21424379d695ac6fe8a0014859a521 SHA-1: 6cc622cf32ffec1c1afa7ebea3f3fc607b1ef90d SHA-256: 36a91abf0c5473123066378e6b9b1d9696d4c750d5594c07e20f678cf858c88b
94 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, while appearing to be a repair manual, is likely a lure to disguise the malicious intent of hosting numerous external links. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious content or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://puurskin.nl/uploads/1/3/0/5/130588484/130588484.html#2003+mitsubishi+montero+sport+repair+manual
    • http://1strebrokerage.com/uploads/1/3/0/5/130590108/xanulojawitizasa.pdf
    • http://3rx.undesirable.us/uploads/1/3/1/4/131405940/330113.pdf
    • http://sugarsugartexas.com/uploads/1/3/1/3/131381497/mepex.pdf
    • http://draftinginoc.davidmichaeldesigns.com/uploads/1/3/1/4/131409474/1828257.pdf
    • http://puurskin.nl/uploads/1/3/0/5/130588484/terms.html
    • http://puurskin.nl/uploads/1/3/0/5/130588484/dmca.html
    • http://puurskin.nl/uploads/1/3/0/5/130588484/policy.html
    • https://sokoson.files.wordpress.com/2020/06/61076826519.pdf
    • https://varaziwatu.files.wordpress.com/2020/06/21833929427.pdf
    • https://tazesetinud.files.wordpress.com/2020/05/6564756029.pdf
    • https://daritawaba.files.wordpress.com/2020/05/76475214532.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_off000062a1.bin
78bf86e616d262553595f9816bcecc7d9b27cfa29a07a85543086117f22dfb2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A1 10432 bytes

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