Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef31bf72a91212ca…

MALICIOUS

PDF

49.0 KB Created: 2020-04-14 02:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36134f437d342385b6ee7c2c39b8edf1 SHA-1: b5ced026f8bf39d9f4037e263f62dfc8c6caeb36 SHA-256: ef31bf72a91212ca23c6f1d1d2edb62a528a6ee4ae849845a88c9c5023c0e104
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to unrelated content, indicating a link farm for SEO manipulation. The document body, though partially corrupted, contains text related to 'Pediatric hypercholesterolemia treatment guidelines' and the wkhtmltopdf application, suggesting a lure to attract unsuspecting users. The ML classifier strongly flagged this PDF as malicious.

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://abraxasroots.org/uploads/1/3/0/7/130776295/130776295.html#pediatric+hypercholesterolemia+treatment+guidelines
    • http://ciescreations.org/uploads/1/3/0/4/130483364/bb22ba611c.pdf
    • http://harrybick.com/uploads/1/3/0/4/130483248/perenejo.pdf
    • http://thebaserevelstoke.com/uploads/1/3/1/3/131379037/2686627.pdf
    • http://briancrowellgolf.com/uploads/1/3/0/3/130313075/xufifozizozabopowato.pdf
    • http://shirtsunder20.com/uploads/1/3/0/7/130738553/tuwupuve-nidon-razuv.pdf
    • http://hierbasdelalma.com/uploads/1/3/1/0/131070598/junuvefo.pdf
    • http://studiomezik.com/uploads/1/3/0/8/130874623/kuguvipodegilas_bamitiz.pdf
    • http://thececinstitute.org/uploads/1/3/0/6/130604254/jatotikeduku.pdf
    • http://designthejourney.net/uploads/1/3/0/3/130323542/5480175.pdf
    • http://animalhousenola.org/uploads/1/3/0/8/130814360/6579891.pdf
    • http://tarairwinart.com/uploads/1/3/0/6/130620899/5447217.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f53.bin
ee48bc1f578b9248ae0115b3746e7448a2e36db62b5203e8260553dbd217d710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F53 7760 bytes
font_01_sfnt_off0000ad93.bin
999525c50517e7ccb66b40055490eb49bd8c31d89769e3f0093c83e87d8d5080		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD93 2820 bytes

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