Malicious PDF — malware analysis report

Static analysis result for SHA-256 791eac5430d94e76…

MALICIOUS

PDF

41.1 KB Created: 2020-05-15 22:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 745a5c37135116b1d64175975002ded8 SHA-1: 86df20560638e9de7420ac66833497d3d9b41d24 SHA-256: 791eac5430d94e76850b88e50793fc6b76dffcf0c61881795f57d705ad815ff0
104 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a coordinated effort to distribute content or redirect users. While no scripts were explicitly extracted, the PDF structure itself is leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://theloganoutlet.com/uploads/1/3/1/4/131407284/131407284.html#event+planning+website+template+free
    • http://ddchealth.org/uploads/1/3/0/3/130323952/8387070.pdf
    • http://wwwmassageandfitness.shop/uploads/1/3/1/4/131453650/a3204.pdf
    • http://chardcity.com/uploads/1/3/0/5/130550951/tetusixasalegulo.pdf
    • http://make-u-up.ca/uploads/1/3/0/7/130740232/xodulafi_sitadojelinaxi.pdf
    • http://semperkill.net/uploads/1/3/1/8/131857421/3551450.pdf
    • http://star9communications.com/uploads/1/3/0/7/130738705/venolof.pdf
    • http://laughandlearnfamilydaycare.com/uploads/1/3/0/5/130550790/nadefux.pdf
    • http://peaceandpranayama.com/uploads/1/3/0/2/130291579/9772517.pdf
    • http://inpursuit21century.org/uploads/1/3/1/8/131856699/3625078.pdf
    • http://soaringknowledge.com/uploads/1/3/0/6/130605399/bileborusujuza_bubinipazuzab.pdf
    • http://littleroe.com/uploads/1/3/0/5/130589132/f2c52.pdf
    • http://smgmusicgroup.com/uploads/1/3/0/6/130605161/javokubuwibak.pdf
    • http://talkfooddenver.com/uploads/1/3/1/4/131482867/xafakules-nunegusoso-zixariz-jenisux.pdf
    • http://makingfacesnz.com/uploads/1/3/0/8/130813025/2646153.pdf
    • http://globalmacroconsulting.com/uploads/1/3/0/7/130775435/borada-vedosuzako.pdf
    • http://rentmyhandymanhusband.com/uploads/1/3/1/3/131379987/favisabekuzajef.pdf
    • http://theverybritishtshirtcompany.com/uploads/1/3/0/6/130620689/xevimezujaf.pdf
    • http://jakobrekve.com/uploads/1/3/0/8/130814055/a9cb4.pdf
    • http://trycryptomove.com/uploads/1/3/0/7/130775277/2fe757056e7d556.pdf
    • http://virginiariverfestival.com/uploads/1/3/0/8/130873867/ca1f42048dc6.pdf
    • http://drzhuweimin.com/uploads/1/3/1/6/131606692/nigufifavusasuderuse.pdf
    • http://ienrichment.net/uploads/1/3/0/9/130969249/zigas.pdf
    • http://nickumelectric.com/uploads/1/3/1/8/131871453/nonegef.pdf
    • http://hunterstephensamg.com/uploads/1/3/0/9/130969834/remisinubenod.pdf
    • http://imaniashante.com/uploads/1/3/1/3/131384142/1860771.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000756d.bin
f981d454bc5c3e7b71533ffbe52391dd46b2dd2d1ebb039d5710f15b5b971d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756D 10140 bytes

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