Malicious PDF — malware analysis report

Static analysis result for SHA-256 8271b451c730808c…

MALICIOUS

PDF

46.9 KB Created: 2020-05-01 01:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 20d73cf7d24dcbb6b41fa2908f42031b SHA-1: 0794472582eb4da0c992cb2f0abaf8722cb95d1f SHA-256: 8271b451c730808c97175b9591baf10d1d14d3d471f5f55acb42816427deeaea
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. These links likely lead to a link farm or are used to distribute further malicious content, suggesting an attempt to manipulate search engine results or redirect users to malicious sites.

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://hkcfoundationforparkinsons.org/uploads/1/3/0/5/130547405/130547405.html#canoeists+guide+to+the+river+severn
    • http://gamcodesigns.com/uploads/1/3/0/3/130313188/1990447.pdf
    • http://bridgecrowdfunding.com/uploads/1/3/0/4/130476579/a9491.pdf
    • http://katedanvers.com/uploads/1/3/1/4/131437742/xavidovaw_kotakejexi_lisokoweviw_rumubaxaxowos.pdf
    • http://mergepoint.org/uploads/1/3/0/6/130639069/muzumuzus.pdf
    • http://humbersidesunshineyoga.com/uploads/1/3/1/1/131164562/400ea.pdf
    • http://crucialiving.com/uploads/1/3/1/4/131407445/rutemivi-sezufodawigugev-mikozifujir.pdf
    • http://thedesigndevil.com/uploads/1/3/0/5/130551063/mimigaje.pdf
    • http://uwogh.com/uploads/1/3/0/4/130478314/vinujo_bedisolegez.pdf
    • http://tsbrie.com/uploads/1/3/1/4/131438164/9bf5d.pdf
    • http://onlinehypnosiscentre.com/uploads/1/3/0/7/130739662/fesutitepizaku-womijened.pdf
    • http://watch-closet.com/uploads/1/3/0/7/130775949/8313544.pdf
    • http://ananyais.com/uploads/1/3/0/2/130289240/1f1b4.pdf
    • http://thecinnamonkitchen.org/uploads/1/3/1/4/131483167/ff42f93c49d27c9.pdf
    • http://spydersupportsolutions.com/uploads/1/3/0/6/130639452/kimelozuke.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_off00008f97.bin
e01cabc654f89e336e4ae9c22ffdfc44349306517727f579621d09730a99c9d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F97 8216 bytes

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