Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f65355c8c047ae1…

MALICIOUS

PDF

37.8 KB Created: 2020-04-25 21:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 252f3816abae1c3a609f7d499ae47f97 SHA-1: 70b7ac44d366f323d9559701e43170bee3def902 SHA-256: 1f65355c8c047ae1d47681d10bb3b8de7c72e93f2b99465e081762530d44381f
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though heavily obfuscated, contains text suggesting it is a 'Smart watch manual t8', which is likely a lure to disguise the malicious intent. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious content within the PDF structure.

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://wildchild.dance/uploads/1/3/0/7/130738537/130738537.html#smart+watch+manual+t8
    • http://jackstevenswelding.com/uploads/1/3/1/4/131452771/8103227.pdf
    • http://coreinformation.net/uploads/1/3/0/6/130622048/b9cdb.pdf
    • http://surreypersonalbest.com/uploads/1/3/0/6/130640191/supizi.pdf
    • http://karasowles.com/uploads/1/3/0/5/130543588/zomovazogasolif_luxurobewudis.pdf
    • http://superhgh.com/uploads/1/3/0/7/130738607/pidawizib-kebagawejof.pdf
    • http://stoprentny.com/uploads/1/3/1/3/131398359/19ae220.pdf
    • http://eshypnosis.com/uploads/1/3/0/4/130483583/9321373.pdf
    • http://omarsamaniego.com/uploads/1/3/0/5/130590778/fitijokorixevo-rozizixutazab.pdf
    • http://modernedgehomeimprovements.com/uploads/1/3/0/7/130740129/lurubixezer-bivixumivogidu.pdf
    • http://workonthehouse.com/uploads/1/3/0/6/130639763/pibotalav.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_off00005b1f.bin
bf3575bbcf9b2d363eae54f73c61fbaa2d91ec1cb17a8755c149347b1f455f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1F 9680 bytes
font_01_sfnt_off00007df2.bin
eaa4dde51fd04d4db8dc223d97e5e1aeb2070941b7c144db1acc557f645d9ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF2 4184 bytes

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