Malicious PDF — malware analysis report

Static analysis result for SHA-256 7897f36f1f0a05b3…

MALICIOUS

PDF

40.6 KB Created: 2020-04-09 11:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6becbf99124152d440db2ddfdce80736 SHA-1: 0f65cc5330c663eaf035dd954cc6a84f4c5ec919 SHA-256: 7897f36f1f0a05b37099f22fd1681093990c57ced772d022bbdaafe675c375da
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, indicative of a link farm or SEO spam campaign. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent. The primary goal appears to be directing users to a network of external websites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://khodgkinsonbuilders.com/uploads/1/3/0/4/130483167/130483167.html#que+es+el+enlace+sigma+y+pi+del+carbono
    • http://aubriegroesbeck.com/uploads/1/3/1/4/131452823/fepisufi.pdf
    • http://azadicoaching.com/uploads/1/3/0/5/130588668/1903051.pdf
    • http://ucfrugby.org/uploads/1/3/0/7/130775321/1007707.pdf
    • http://milindasmith.com/uploads/1/3/0/5/130542853/33abf127d92269.pdf
    • http://newvisionedsolutions.com/uploads/1/3/0/9/130969332/zaxezoxi.pdf
    • http://psrglobal.net/uploads/1/3/1/4/131411245/0e555b28c5e1ba8.pdf
    • http://longarmlaurie.com/uploads/1/3/0/4/130435784/dojuten_tokikoxapek_rajujepedunago_juluvasu.pdf
    • http://pourtoninfo.com/uploads/1/3/0/7/130738700/tomojidaraj_sixezikutakuwa_nakuwoxorobozax_rajivono.pdf
    • http://sa7ant.com/uploads/1/3/1/4/131452814/6389212.pdf
    • http://leohairdye.com/uploads/1/3/0/2/130289782/9931951.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000699b.bin
ecc0f4a740350b4eca1169b6f9dda35cb63953139f0eb1cbe777491f773e48bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699B 8416 bytes
font_01_sfnt_off0000888b.bin
c10aafb803240ed6920eb9941bc2177edc25d5f96875ad1978bc7010367facdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888B 3080 bytes

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