Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ee4eae99c5b8c2…

MALICIOUS

PDF

33.6 KB Created: 2020-06-04 06:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43cbb11953c6af0fb79dde81bcf8b0de SHA-1: 0b5d80cabe58cd0802de5a2748945ccee82659f2 SHA-256: 05ee4eae99c5b8c21d0adcc5c036214296375a79b9164723666c0b6ca0ecbec4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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://smokin.tires/uploads/1/3/1/6/131637030/131637030.html#icao+annex+18+pdf+download
    • http://wlmlfm.com/uploads/1/3/0/6/130639409/858ffeee3.pdf
    • http://disneyismylife.com/uploads/1/3/0/2/130288379/nutopebi.pdf
    • http://convertiblehelicopter.com/uploads/1/3/0/4/130489248/3f9c66a768b15a4.pdf
    • http://cliniqueeducosante.com/uploads/1/3/0/9/130969415/nutaxemido.pdf
    • http://noccassoc.org/uploads/1/3/1/4/131453464/rikiwopavim.pdf
    • http://extractioncity.com/uploads/1/3/0/4/130488969/a25de38efd3198.pdf
    • http://morganelwell.net/uploads/1/3/0/4/130483537/kelavidufo-lagekazeru.pdf
    • http://smokin.tires/uploads/1/3/1/6/131637030/terms.html
    • http://smokin.tires/uploads/1/3/1/6/131637030/dmca.html
    • http://smokin.tires/uploads/1/3/1/6/131637030/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wuxewaxijij.files.wordpress.com/2020/06/34262138409.pdf
    • https://najileriwis.files.wordpress.com/2020/06/kafisaxokanejaw.pdf
    • https://viditesu512119844.files.wordpress.com/2020/06/47906116108.pdf
    • https://faxifikiru.files.wordpress.com/2020/06/xadotezulazekilov.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005932.bin
0989f22f4dc9534e922aef6a0f69b0acbffe586b14c79f4026fd37cac155930a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5932 9996 bytes

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