Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf6f994a38a32a2…

MALICIOUS

PDF

33.6 KB Created: 2020-06-06 12:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2de1640c7784fa6458076177e30b853c SHA-1: 39038c28e493e81da545f16fa9a414830e2dcaf7 SHA-256: fbf6f994a38a32a2d8e8512b34cbd7c682235bf789ac89810cd69288ea3966a3
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to domains that appear to be part of a link farm designed for SEO manipulation. The document body is largely unreadable, but the presence of numerous URLs suggests a redirection or content-luring scheme. No scripts were extracted, limiting the analysis of direct payload delivery.

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://sherwoodsuites-vi.devsite-1.com/uploads/1/3/0/6/130604018/130604018.html#if+this+was+a+movie+lyrics
    • http://brooktheater.com/uploads/1/3/0/3/130313243/rovoxaluberufu.pdf
    • http://parakhin.name/uploads/1/3/1/3/131380505/5934906.pdf
    • http://jmichaelconstruction.com/uploads/1/3/0/4/130483275/menitufadiw.pdf
    • http://mc-juridischadvies.nl/uploads/1/3/0/6/130604512/93fc3bd6.pdf
    • http://sherwoodsuites-vi.devsite-1.com/uploads/1/3/0/6/130604018/terms.html
    • http://sherwoodsuites-vi.devsite-1.com/uploads/1/3/0/6/130604018/dmca.html
    • http://sherwoodsuites-vi.devsite-1.com/uploads/1/3/0/6/130604018/policy.html
    • https://mavuwepezigi.files.wordpress.com/2020/06/rewakefepukovajovuseren.pdf
    • https://fikawigeb.files.wordpress.com/2020/06/42684601682.pdf
    • https://banaxog.files.wordpress.com/2020/06/59592163974.pdf
    • https://rojevaliri.files.wordpress.com/2020/06/44139637228.pdf
    • https://wolodexizip.files.wordpress.com/2020/06/dugekewevobotegazuja.pdf
    • https://debamopexa.files.wordpress.com/2020/06/gerodaradutibid.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_off0000574e.bin
ab57f0e693007f06b41c5c970f4c31d3676207e10113e6df6898b39eb7189e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x574E 11404 bytes

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