Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae0c0c7047ce16f…

MALICIOUS

PDF

43.7 KB Created: 2020-06-21 17:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b799e0b85f87e9ae00032ef1201b5b43 SHA-1: 73cd0d562850dde05d1061e0d95fb924000a6e39 SHA-256: 5ae0c0c7047ce16f1a0bd754faa8cd6106191c9d1b2d0f026bdd727b88bfe495
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are structured as link farms, suggesting an attempt to host malicious content or redirect users. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a 'download button' heuristic further supports a malicious intent to trick users into downloading a payload. No scripts were extracted, but the overall structure and heuristics point to a downloader or redirector.

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://fitbychoice.com.au/uploads/1/3/1/3/131398025/131398025.html#windows+movie+maker+tutorial+2012
    • http://chipfreeman.rpjandco.com/uploads/1/3/0/8/130814225/dofusu.pdf
    • http://sourcesounding.com/uploads/1/3/1/8/131857213/1649840.pdf
    • http://pureartproductions.com/uploads/1/3/0/7/130740210/2cdf7f.pdf
    • http://royalalbertapageantry.com/uploads/1/3/0/7/130775258/judag.pdf
    • http://theagencyexchange.com/uploads/1/3/0/5/130588551/majiv.pdf
    • http://gravidadepqd.com/uploads/1/3/1/0/131070189/gerufuriv.pdf
    • http://lauranorge.com/uploads/1/3/1/4/131482881/xipixaje-besokogiza-dilurabakatalu.pdf
    • http://iamhaomingliu.com/uploads/1/3/0/2/130273625/e9975ca7217.pdf
    • http://succeedwithbrian.com/uploads/1/3/1/3/131382942/5f6cfdb9b1.pdf
    • http://22f.undesirable.us/uploads/1/3/1/0/131070160/3758427.pdf
    • http://bowsoverbros.com/uploads/1/3/0/3/130313376/vujazot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067fa.bin
5139f22429839d943a2bc768fa84c1841027a963050b383e505a9b0763ef1535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FA 5408 bytes
font_01_sfnt_off00007a60.bin
b1290c13b2fb4d8318a23a2ed7f8a00b45c918eeaf1594a18d77b834c0126bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A60 12528 bytes

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