Malicious PDF — malware analysis report

Static analysis result for SHA-256 3235fda099b50ee7…

MALICIOUS

PDF

52.7 KB Created: 2020-04-10 05:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2c1d11ecf2cff9724bf712f1adb01ac SHA-1: e712fb7aeededb043abba5015751289e5b9f7562 SHA-256: 3235fda099b50ee772dd297c16c3e16822ad7c72855b8128246cba08053a5ed5
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, includes a URL that matches one of the extracted links. This suggests the primary purpose is to direct users to a network of websites, likely for SEO spam or to host further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://casualmondayscomedy.com/uploads/1/3/0/7/130739169/130739169.html#efemerides+de+octubre+2018+mexico+para+ni%C3%B1os
    • http://reubenreuben.com/uploads/1/3/0/6/130639364/86c262acfbfdc1e.pdf
    • http://jkpetcremations.com/uploads/1/3/0/7/130738861/jatuvubom.pdf
    • http://jackeddads.com/uploads/1/3/0/5/130538941/d6642a87.pdf
    • http://mikimortgages.com/uploads/1/3/0/6/130639164/aad69394dbf5281.pdf
    • http://silverhillconsulting.net/uploads/1/3/0/4/130483428/7567105.pdf
    • http://feistyfighter.org/uploads/1/3/1/4/131454065/4559567.pdf
    • http://auindiacart.com/uploads/1/3/0/6/130639380/2113186.pdf
    • http://thegiftfromus.com/uploads/1/3/0/6/130640235/5183063.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081c1.bin
0e5945af8c29e7e773861e477ca879c52431f74660c452af508a893a785950c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C1 8512 bytes
font_01_sfnt_off0000a08d.bin
16374c43fefb3fb406266acbe16aee7d7122405634c1b68ba02c6c95ae4378ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA08D 4196 bytes
font_02_sfnt_off0000add5.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADD5 16036 bytes

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