Malicious PDF — malware analysis report

Static analysis result for SHA-256 776bffa0d4d36a92…

MALICIOUS

PDF

34.2 KB Created: 2020-06-06 11:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b04ea0b3faa79fc450fa4a41a7d8eb0 SHA-1: dfc86adc8a396d5f6782cca0119955f212f751bb SHA-256: 776bffa0d4d36a92ff24f7fe41916680d9110bc9436bb8f7f38c2fc64db6b663
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive URL farm suggest an intent to redirect users to potentially harmful content, possibly via embedded JavaScript, though this could not be confirmed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kbtrainingcenter.com/uploads/1/3/1/4/131483317/131483317.html#masello+autos+san+justo
    • http://mail.inkbycassie.com/uploads/1/3/1/6/131606405/jikupotawafaro.pdf
    • http://acceleratedfirm.com/uploads/1/3/0/6/130639311/rurefimolaz.pdf
    • http://gkgtraining.com/uploads/1/3/0/6/130621217/voturupeluwen_fekexaluxugor_sotudabubi_zasitidedavub.pdf
    • http://facilitatorcoach.net/uploads/1/3/0/2/130289392/zuvanumawideba.pdf
    • http://prawer.de/uploads/1/3/0/8/130874591/tunugizejuvafagad.pdf
    • http://empoweredyouthprograms.com/uploads/1/3/0/6/130604905/8533819.pdf
    • http://3minspection.net/uploads/1/3/0/3/130313459/101475.pdf
    • http://foxaccountingandbookkeeping.com/uploads/1/3/0/4/130476462/femesu.pdf
    • http://kbtrainingcenter.com/uploads/1/3/1/4/131483317/terms.html
    • http://kbtrainingcenter.com/uploads/1/3/1/4/131483317/dmca.html
    • http://kbtrainingcenter.com/uploads/1/3/1/4/131483317/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vikotefo.files.wordpress.com/2020/06/ronelurojuri.pdf
    • https://viwedibimu.files.wordpress.com/2020/06/tasirujofafe.pdf
    • https://fabajigepalo.files.wordpress.com/2020/06/wagigutuwotolasekudofixil.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000599e.bin
7e7daae8ab33cefaf34657a590d10e95d25c8c52cb5864fff86be926058c04c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x599E 10580 bytes

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