Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc425c7cbe7e378…

MALICIOUS

PDF

40.8 KB Created: 2020-03-29 21:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 43bda90c0cd3a1922f2aa2d290c57bd5 SHA-1: 677d359ec1563182ff9b7deecfb5726af9e71c76 SHA-256: 6cc425c7cbe7e378b33ee8308393a2d5ad9f3b7934450796908681ea0f968dc4
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or content distribution scheme. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification. No scripts were extracted, but the sheer volume of external links indicates a non-standard and potentially malicious purpose.

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://restage.tv/uploads/1/3/0/2/130289310/130289310.html#a+christmas+carol+book+chapter+summaries
    • http://beautystarhair.com/uploads/1/3/0/6/130622080/magodosezupoberi.pdf
    • http://intuitive-marketplace.com/uploads/1/3/0/5/130588778/0a3d88bec585.pdf
    • http://isotherme.eu/uploads/1/3/0/3/130379285/8060799.pdf
    • http://taylorgantt.com/uploads/1/3/1/3/131379231/21359.pdf
    • http://swingersclub626.org/uploads/1/3/0/6/130639933/f8aae71797a.pdf
    • http://royalgb.com/uploads/1/3/0/8/130874160/zajametalilozux.pdf
    • http://bettering-me.com/uploads/1/3/0/6/130620746/c2b1deba083d541.pdf
    • http://stop-look-listen.net/uploads/1/3/0/7/130740513/vobupomegadogeva.pdf
    • http://elina-ja-aleksi.com/uploads/1/3/0/4/130476650/1e66df.pdf
    • http://nucorelab.com/uploads/1/3/0/6/130639023/36113a62c.pdf
    • http://oest.juniortalent.dk/uploads/1/3/1/4/131406432/wazosetegarovo_bopikenemalabok_kixuvo.pdf
    • http://tropicalpainting.net/uploads/1/3/0/6/130639023/rixexonurov.pdf
    • http://prestigepropertyconsultants.org/uploads/1/3/0/2/130272619/kevawijag-mogubemezakex-wifogitisiw-tuzidipibo.pdf
    • http://teammba904.com/uploads/1/3/0/5/130588989/1994916.pdf
    • http://aiotherapymanagement.com/uploads/1/3/0/6/130621780/186a0cf.pdf
    • http://jacquescampfineart.com/uploads/1/3/0/7/130776483/zomanajanolivo.pdf
    • http://leveluprenovations.com/uploads/1/3/0/6/130604152/pegobevolofutit.pdf
    • http://vintagehomedallas.com/uploads/1/3/0/7/130775917/aedbed0ab35274.pdf
    • http://bites-brains-3.com/uploads/1/3/1/3/131380998/kiwewenumibasos-mubulawanaf-xefulewosuveke.pdf
    • http://kinneycustomdesigns.net/uploads/1/3/0/2/130287521/wunewatewefurop-rolibi-xupojumigesagaz-tupanewogawoke.pdf
    • http://nomadedservices.com/uploads/1/3/0/4/130479008/mokuseroror-moziweleso-zefexokezigi.pdf
    • http://sweetfrivolity.net/uploads/1/3/0/2/130287845/motonaruka.pdf
    • http://rossunlimitedinc.com/uploads/1/3/0/5/130589137/79bb7c87fa.pdf
    • http://bulkingbarbie.com/uploads/1/3/0/4/130483634/e9dce529.pdf
    • http://khangonline.com/uploads/1/3/0/5/130590416/patumod.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_off0000777f.bin
e7370327b965592ddf557f4eef80b28df78bba6538647dce2a5e969aaf6e279e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777F 7672 bytes

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