Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd52bd3a72960d3…

MALICIOUS

PDF

32.6 KB Created: 2020-04-04 06:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1fa10c2cdc4fedcd618a9a953828de3c SHA-1: 7427d46d40eb1cc619e0224a3d3459acaa2bd8d9 SHA-256: efd52bd3a72960d38393aee8b6d2475094afd3b69877ddabc0dcc760abbeb0d3
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text fragments and URLs that align with this finding. The primary attack pattern appears to be directing users to a network of potentially malicious websites, possibly for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://empowerufitness.org/uploads/1/3/0/3/130323092/130323092.html#photo+art+studio+vtech
    • http://atlanticvillehomes.com/uploads/1/3/0/9/130969597/pejopowozegunuz-joton-fubibiwadob-xonekomuten.pdf
    • http://suite420marketing.com/uploads/1/3/0/7/130740596/lepigureporiva.pdf
    • http://vacationhomesresorts.com/uploads/1/3/0/3/130313221/57a8e0abd39.pdf
    • http://stoprentny.com/uploads/1/3/0/3/130313117/vunowuvag_wadesetigijerev_vebivoxaz.pdf
    • http://surfcityfitclub.com/uploads/1/3/0/9/130969603/1467795.pdf
    • http://armadilloescapes.com/uploads/1/3/0/7/130776572/buwolamaf-panoz-bedizipifo.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_off000057e9.bin
a2ae85a47d3a4ad6f370d9d33b78bbaa06ae6d4d94658d7852c211453492dd31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E9 7864 bytes

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