Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c64ec1131dc52c…

MALICIOUS

PDF

54.2 KB Created: 2020-04-07 05:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 232d3ee9431bbbf09c4e7bcf36f0ae04 SHA-1: 32f712a09233d33d1f5978901174aa86101eee9a SHA-256: e3c64ec1131dc52cba7fc2696ec2b1c18124deb43e5a9cb7a4c06e95b953786e
96 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, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. No scripts were extracted, and the document body is largely unreadable, but the presence of numerous external URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://switalia.com/uploads/1/3/0/7/130776063/130776063.html#calculo+frecuencia+cardiaca+maxima+por+edad
    • http://peacefulbeginningsds.com/uploads/1/3/0/9/130969291/pexojegamawar-jesewokiko.pdf
    • http://villarealmotors.com/uploads/1/3/1/4/131438788/6610880.pdf
    • http://morethan4productions.com/uploads/1/3/0/5/130543198/d1a67953.pdf
    • http://myamericanbuilthomes.com/uploads/1/3/0/6/130621068/risavixezen.pdf
    • http://massagebyanj.com/uploads/1/3/0/7/130739827/732355.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_off00008062.bin
5278024270de67705d3a5034a26ce2f5e1d9e53f50705cc770b2190155f81e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8062 6728 bytes
font_01_sfnt_off00009105.bin
0650bd981e810a64a029a2bd4dc1308d29ad553e795c29bc2caf1315be9552fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9105 9588 bytes
font_02_sfnt_off0000b2f8.bin
cf0e7f10fe86d23ef6bb47ee1723c76697ef66928baf681265d6165ad35484e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F8 16644 bytes

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