Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab599f650d7b575…

MALICIOUS

PDF

41.6 KB Created: 2020-04-11 11:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 767f871181301615df1b0d48c74bd78f SHA-1: 616f0d921c3681eee3b0663fd380240a7a986ee8 SHA-256: 6ab599f650d7b57509973faf10da15f364c779c37d0d340e0949664b6351e263
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, indicating a link farm designed to redirect users to external sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to drive traffic to a network of linked PDFs. The presence of a URL in the document body further supports this, pointing to a potential lure for malicious content or phishing. No scripts were extracted from this sample.

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://74-123-77-240.mgwnet.com/uploads/1/3/1/3/131379361/131379361.html#regular+and+irregular+verbs+worksheet+pdf
    • http://kwarsmoothieshop.com/uploads/1/3/0/2/130287932/aaa85a.pdf
    • http://customthreadink.com/uploads/1/3/0/8/130813888/ad57261ccccee1.pdf
    • http://knightsmun.com/uploads/1/3/0/9/130969976/bixodile_wifotoxukug_tejufugelusuwem.pdf
    • http://dildrones.net/uploads/1/3/0/6/130604045/3189547.pdf
    • http://genconwma.com/uploads/1/3/0/9/130969905/5a524cfd29c57.pdf
    • http://dukesrefrigeration.com/uploads/1/3/1/3/131380591/rufuputagezoge.pdf
    • http://modfish.org/uploads/1/3/0/2/130289641/letajepab.pdf
    • http://maketorontohome.net/uploads/1/3/0/5/130551434/nojisifekuxuba_rufofi_xinolexonomos.pdf
    • http://noveljourneyer.life/uploads/1/3/0/5/130588240/xuwumetatomogajek.pdf
    • http://tendtudo.org/uploads/1/3/0/5/130546759/2622829.pdf
    • http://davidsherwinmassage.com/uploads/1/3/1/4/131408528/xadiwid_jiliwebev.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000602b.bin
8901425fdffbb2edcab9c5a7258a108b79212c332affbdbe73f729d6dbe2778a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602B 10680 bytes
font_01_sfnt_off000084ee.bin
40a403f8312ff9c93041e514e965a4d57d797ba541f1da729710ef172887bfc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84EE 16060 bytes

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