Malicious PDF — malware analysis report

Static analysis result for SHA-256 6308811809134361…

MALICIOUS

PDF

48.9 KB Created: 2020-04-06 15:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5e3c6e91f8dd93ef076d68e223a7deb SHA-1: 66f26a19e81f8abe4ec2248fdcd43155115ffd77 SHA-256: 63088118091343611ad1f96669e44c5d97450871d1331a1d9514d9d6166d4df2
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are structured as SEO spam or link farms, suggesting a malicious intent to redirect users to potentially harmful sites. The document body includes a URL that appears to be a lure, disguised with a topical title about forced displacement in Colombia. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a high likelihood of malicious redirection, possibly involving embedded JavaScript to facilitate the process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://korumall.com/uploads/1/3/0/2/130288391/130288391.html#porque+se+produce+el+desplazamiento+forzado+en+colombia
    • http://jbbirds.com/uploads/1/3/0/4/130488286/1f31e58.pdf
    • http://southern-climate-control.com/uploads/1/3/0/4/130489465/dubawamo.pdf
    • http://alumniunitbv.net/uploads/1/3/0/8/130874156/2812515.pdf
    • http://ukcpioneerdays.com/uploads/1/3/0/7/130776756/bivasawexajel.pdf
    • http://mta-sts.mail.hppsco.com/uploads/1/3/1/4/131407135/7f94f0a22891f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ac.bin
42cc6e0af49f6181baf62742aa9acd896182261b1e5024b1a0fa34e8333b8814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AC 9292 bytes
font_01_sfnt_off0000962c.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x962C 2652 bytes
font_02_sfnt_off00009f93.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F93 16036 bytes

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