Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d82614819bd0c64…

MALICIOUS

PDF

37.6 KB Created: 2020-04-06 05:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8fb1c72ced67140859614411b3e8e01d SHA-1: e8c30e5c348dbe898a09e4e825579b513f3e81dd SHA-256: 2d82614819bd0c642b6e0398f16ad7158bc5e0df53f11408977985cef8eb2003
62 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs on different domains, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, contains the phrase 'Como hacer un permeametro de carga variable' and the URL 'http://kelbels.org/uploads/1/3/1/3/131381166/131381166.html#como+hacer+un+permeametro+de+carga+variable', suggesting a lure related to scientific equipment. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is a malicious attempt to manipulate search engine results or distribute content through a network of sites.

Heuristics 3

  • 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
  • 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://kelbels.org/uploads/1/3/1/3/131381166/131381166.html#como+hacer+un+permeametro+de+carga+variable
    • http://naturalane.com/uploads/1/3/0/6/130639746/4908828.pdf
    • http://ak4h.org/uploads/1/3/0/6/130621345/zukegokenipemo-rebugomag-wuzamuvilid-fepuwebebewe.pdf
    • http://cliniclaser.org/uploads/1/3/0/8/130813095/c04abe5b34d.pdf
    • http://amiraswellnesscenter.com/uploads/1/3/0/5/130543840/89f7128cf.pdf
    • http://kathygaulke.com/uploads/1/3/0/9/130969858/situbumital.pdf
    • http://copithornetransportmanuals.com/uploads/1/3/1/1/131164562/noriju.pdf
    • http://aivets.eu/uploads/1/3/0/6/130620436/kumaledu.pdf
    • http://jeffwoodsmith.com/uploads/1/3/0/6/130621214/takuvebarobowugiwub.pdf
    • http://gkiinc.com/uploads/1/3/1/4/131406427/72339f712.pdf
    • http://luran.es/uploads/1/3/1/4/131408256/6623296.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_off00006775.bin
b1e063f5ce01c1e62f942c941ac171a91a45d4e1831691860501ebb7814e9500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6775 8828 bytes

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