Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a258df2784bd1e2…

MALICIOUS

PDF

51.5 KB Created: 2020-04-16 11:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07c233ef57ae25ea8367eb394fee20e3 SHA-1: eac2174cbafc9ea9cf89632001d05c4eba4506f0 SHA-256: 0a258df2784bd1e2a78aab47f04ded0e929cf58f716f08b5998d15bfcc2543ef
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external PDF files hosted on various domains, indicative of a link farm or a phishing lure. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports this assessment. The document body text, though heavily obfuscated, contains a reference to 'Tableau 2019. 2' and a URL that appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://miracleinabucket.com/uploads/1/3/1/1/131164218/131164218.html#tableau++2019.+2
    • http://ithacanorthsideunited.org/uploads/1/3/1/0/131071188/54ec8ecac.pdf
    • http://encounteringantipolonism.org/uploads/1/3/0/7/130739904/segaxafuxo-belam-bakiwafukixux.pdf
    • http://dentalsleepservice.com/uploads/1/3/0/2/130272280/sedules.pdf
    • http://madeleinerosekelly.com/uploads/1/3/0/4/130435670/perogowexid.pdf
    • http://maeveleslieart.com/uploads/1/3/0/8/130814234/ratowojeza_wafife_namodiwakib.pdf
    • http://techwithmsmac.com/uploads/1/3/0/7/130775362/kerike_sigefimonepuvus.pdf
    • http://blueskyestore.com/uploads/1/3/1/3/131398428/641c43.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_off0000a19a.bin
cbebf263af1b9c863bafdd99d066568ac45e2f35d4947b9e677e7bf1d5fba80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA19A 8588 bytes

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