Malicious PDF — malware analysis report

Static analysis result for SHA-256 192a2d908d1444bd…

MALICIOUS

PDF

37.9 KB Created: 2020-04-07 02:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ff7e1efc2ed6a75a80a8ea2e7f812935 SHA-1: 92aac972b35a88aad3f751146781213d32747d9a SHA-256: 192a2d908d1444bd63d429bddd92583f00b59616cc75eeaac7e62bb4e2d1c251
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which appear to be part of a link farm designed to host further malicious content. The document body, though obfuscated, contains a URL that mimics a sheriff's department search result, likely a lure to encourage clicks. The ML classifier strongly indicated maliciousness, and the presence of many external links suggests a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://impact-active.com/uploads/1/3/0/5/130588240/130588240.html#tuscaloosa+county+sheriff%27s+department+tuscaloosa+al+35401
    • http://appcasso.org/uploads/1/3/0/7/130739658/6946062.pdf
    • http://dealerfly.net/uploads/1/3/1/4/131406607/xatavebivuditajajode.pdf
    • http://prakruti-anukruti.com/uploads/1/3/0/6/130640023/jixajamidinevip_jetabudas_nexexidosa.pdf
    • http://savethesweeneys.com/uploads/1/3/0/4/130488387/dibudagawerij.pdf
    • http://sodacitydesign.com/uploads/1/3/0/5/130588982/fifiwafarok_xuduzumutep.pdf
    • http://peaceandmudpottery.com/uploads/1/3/1/4/131437780/6293161.pdf
    • http://fatcatsam.com/uploads/1/3/1/3/131379945/fenuxutedavigekifon.pdf
    • http://troop360bsa.com/uploads/1/3/1/4/131483627/4684930.pdf
    • http://bellemodas.com/uploads/1/3/0/2/130287506/zatixunadukumut.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_off000067ef.bin
31bd062030fc477ce2e97f139f3af3894ea308698e077bfd73ca68a027e4cc1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EF 8444 bytes

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