Malicious PDF — malware analysis report

Static analysis result for SHA-256 f866a756ddb4f0eb…

MALICIOUS

PDF

39.3 KB Created: 2020-04-11 23:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3276da61636c46e8ee5b062b16085b2 SHA-1: 51aa14fc21d3bb94799432589be7bff2e5540c59 SHA-256: f866a756ddb4f0eb7d3a899f05c840401c58e608d77cc16e8cdfe40186c79ad0
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of SEO spam or a phishing lure, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the presence of numerous external links. The document body, though heavily obfuscated, contains a URL that appears to be a search result for 'Dune frank herbert amazon', suggesting an attempt to attract traffic through deceptive content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of 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://jhrpropertyltd.com/uploads/1/3/0/7/130738973/130738973.html#dune+frank+herbert+amazon
    • http://aquarelclothing.com/uploads/1/3/0/6/130622038/5766007.pdf
    • http://therealpatikayy.com/uploads/1/3/1/4/131455543/ribovagewemajej.pdf
    • http://hootsweethoot.com/uploads/1/3/0/6/130621220/muporajudak-sejurelunada-vitilelibotorux-donaritipel.pdf
    • http://swainbuildersinc.com/uploads/1/3/0/7/130775431/4741278.pdf
    • http://xcorrupt.com/uploads/1/3/0/2/130271048/fc899f575.pdf
    • http://providence-title.com/uploads/1/3/0/7/130739363/9540247.pdf
    • http://edwardsvalleyplumbing.com/uploads/1/3/0/7/130739837/sejifun_zusixagopo.pdf
    • http://nlecengineeringconsulting.com/uploads/1/3/0/7/130776043/6604809.pdf
    • http://cierraprideart.com/uploads/1/3/0/5/130541904/getunawako_godak_puregawapubejo_renedapanadared.pdf
    • http://mail.comeandseefbc.org/uploads/1/3/0/5/130541064/1370665.pdf
    • http://amandasuephotography.com/uploads/1/3/1/0/131070190/xewuru.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_off000073b5.bin
50a52da7aaec57b2e3d5d15eafb6da6ce9d14e173df024684b8639069a993792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B5 7576 bytes

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