Malicious PDF — malware analysis report

Static analysis result for SHA-256 923d6eb80ec40b6b…

MALICIOUS

PDF

32.7 KB Created: 2020-04-16 04:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eadcf573afd77be400b99352008680bb SHA-1: b4b2081623e3ece5c884216192751c0c886a619a SHA-256: 923d6eb80ec40b6bea761c4b5a6edf1f8d89fce891264c594a5ed132feaf01c9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.001 PowerShell

The PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to other PDF files on unrelated domains, suggesting a link farm or distribution network. The document body mentions 'deionized water sds sheet', likely a lure to entice users to open the document. No scripts were extracted, but the extensive use of external links and the ML classification strongly indicate a malicious intent, possibly for SEO manipulation or to serve as a dropper for other malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cupofjavaproductions.com/uploads/1/3/0/6/130604748/130604748.html#deionized+water+sds+sheet
    • http://katehopestore.com/uploads/1/3/0/4/130476850/wijuta.pdf
    • http://babeandberg.com/uploads/1/3/0/8/130873870/pubowu-bapanopu-musijizab.pdf
    • http://movimientomexicano2018.org/uploads/1/3/0/7/130740340/sizowisiguxo.pdf
    • http://willowscreekllc.com/uploads/1/3/1/6/131606133/fifujikupasugisum.pdf
    • http://pdxpersonalinjurylaw.com/uploads/1/3/0/7/130775229/bugataxutiregu_miwimav_juduxabutezef_fajufuj.pdf
    • http://noelsbaklava.com/uploads/1/3/0/3/130379118/8ceccd0a2464.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_off0000594f.bin
f00c81b6b5c3e7390bcbc69bc8a41d173e5848c35e302db2b982efb405cff7e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594F 7748 bytes

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