Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce20b8e3cf1b18a4…

MALICIOUS

PDF

33.0 KB Created: 2020-06-18 00:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8def0c460c6bf02b5d78f3dd65017c9 SHA-1: c503cbc2279961ca1d87641b103ce90c5cece267 SHA-256: ce20b8e3cf1b18a44d379377404731bf19112c54f5262227c7db26c6fc0d0684
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. The document body text is heavily obfuscated but contains references to a 'Hoover windtunnel v2 repair manual', likely a lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ahanihayk.com/uploads/1/3/1/1/131164486/131164486.html#hoover+windtunnel+v2+repair+manual
    • http://estherhunter.com/uploads/1/3/1/6/131637247/b051049d88ce.pdf
    • http://bethgallego.co.nz/uploads/1/3/1/6/131636586/suxipar.pdf
    • http://mta-sts.sueheaser.com/uploads/1/3/0/8/130814339/butefanowod_nonerugip.pdf
    • http://popupberlin.com/uploads/1/3/0/5/130588937/5945813.pdf
    • http://choosedifferent.co.uk/uploads/1/3/0/5/130543272/lijanararabo_pudatetaniguwav_fepoterelibog_fiviwusotelod.pdf
    • http://kikilioskanestai.lt/uploads/1/3/0/3/130313054/barefa.pdf
    • http://q95oldies.com/uploads/1/3/0/5/130588798/lipepizaba-sefuxoxilax-denure-vajoluzoji.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ba.bin
b03e4f2fea11da6f63e8404763693496e547d3b1504bb7ed99d400ec9ae93416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48BA 5056 bytes
font_01_sfnt_off000059da.bin
f60c894b31b316db16c54f680a370b9caa517a354977ea40aedb32c166558b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59DA 8912 bytes

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