Malicious PDF — malware analysis report

Static analysis result for SHA-256 670864169399022d…

MALICIOUS

PDF

39.4 KB Created: 2020-04-06 09:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 20280cb533e6406a39dca6e203e4bfa2 SHA-1: baa034f572a7f288adf265fa79d0af1eb81c39ae SHA-256: 670864169399022ddbd2743823541c4b58dfbebfc5447b49d88f19f69f433706
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDFs with numeric slugs, indicative of a link farm. The primary URL found in the document body, http://treasures4yourheart.com/uploads/1/3/0/7/130776343/130776343.html#como+calcular+metro+cubico+de+arena, is part of this pattern. The heuristic PDF_SEO_LINK_FARM strongly suggests this is a malicious attempt to generate traffic or host malicious content. No scripts were extracted, but the structure and embedded URLs point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://treasures4yourheart.com/uploads/1/3/0/7/130776343/130776343.html#como+calcular+metro+cubico+de+arena
    • http://spedtechteacher.com/uploads/1/3/0/7/130739583/fomapixisumi.pdf
    • http://elizabethjacksonpiano.com/uploads/1/3/1/0/131070279/bogomaxo.pdf
    • http://juliescornerart.net/uploads/1/3/1/3/131398154/fifotowufoki-faxasifimura-gusoxela.pdf
    • http://glesbycentre.com/uploads/1/3/0/4/130488604/9916261.pdf
    • http://beorganic.bio/uploads/1/3/0/2/130270761/repazosebuxa-rutuw-xovuj.pdf
    • http://beachesyouthhostel.com/uploads/1/3/0/5/130589158/4761634.pdf
    • http://clancys.info/uploads/1/3/1/4/131407226/3168484.pdf
    • http://ardmacelectric.com/uploads/1/3/0/7/130776239/2268416.pdf
    • http://perspectivedesign.xyz/uploads/1/3/0/6/130639513/buladexugoxiz.pdf
    • http://bandbpoolservice.net/uploads/1/3/0/4/130436226/9223676.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_off00006cb4.bin
63591f28487535ae850faa734674f7478445efe6a7fb4edf20c4a22adc5e9026		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB4 9736 bytes

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