Malicious PDF — malware analysis report

Static analysis result for SHA-256 738a8d35b56117d2…

MALICIOUS

PDF

36.1 KB Created: 2020-03-29 10:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 29bff2a20e92a425db1825011b4d6cd7 SHA-1: 5c0fd3baa455589264704a0d51168fab108cadd1 SHA-256: 738a8d35b56117d2bc02f9a623f50e5633bf8d9744ff2ecdfee85fd972088519
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links pointing to various PDF files hosted on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content indirectly. The ML classifier strongly supports the malicious verdict, and the presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to potentially harmful sites.

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://allamericandogexpo.com/uploads/1/3/0/9/130969976/130969976.html#maths+magic+tricks+in+telugu
    • http://superuberjewels.com/uploads/1/3/0/9/130969407/sivinag.pdf
    • http://djprince.info/uploads/1/3/0/6/130620882/belebexuz_xamifuzalakoliz_jubidepo.pdf
    • http://weddingenchanted.com/uploads/1/3/0/6/130621691/kabinivisavudase.pdf
    • http://www.guitar-hub.com/uploads/1/3/0/5/130589049/gafidurun.pdf
    • http://jbco.org/uploads/1/3/0/7/130776573/kuxotanemezo.pdf
    • http://askjj.me/uploads/1/3/0/4/130490808/kamumipis.pdf
    • http://casavidalahabana.com/uploads/1/3/0/7/130776594/zawurabewawu-dulizi.pdf
    • http://www.elegantspaces.co.nz/uploads/1/3/0/8/130813917/zefawodisat.pdf
    • http://galenagetawaysonmain.com/uploads/1/3/0/7/130775907/474d04f898.pdf
    • http://mshdesignstudio.com/uploads/1/3/0/4/130436242/suzevezetedudet-sosewusosekuz-gibarubepoke-zorelijatupasaz.pdf
    • http://jordanqualls.net/uploads/1/3/0/6/130605344/burum.pdf
    • http://anthonyramosblog.com/uploads/1/3/0/3/130312944/7565060.pdf
    • http://somethingsunnyonline.com/uploads/1/3/0/4/130483350/pekaneg-xoditozedat.pdf
    • http://flourishdevelopment.com/uploads/1/3/0/7/130740087/0ac2be.pdf
    • http://hounslowgiving.org/uploads/1/3/0/5/130551126/3374333.pdf
    • http://misscarladance.org/uploads/1/3/0/7/130740213/4d3743cf.pdf
    • http://snipesconglomerate.com/uploads/1/3/0/2/130272474/b24a017.pdf
    • http://www.kim2design.net/uploads/1/3/0/5/130590724/wimit.pdf
    • http://aclosbanos.com/uploads/1/3/0/6/130621046/vizigi.pdf
    • http://bungalows-semidees.com/uploads/1/3/0/2/130273776/giwerutarube_poburagom.pdf
    • http://milwaukeetoireland.com/uploads/1/3/0/3/130324357/1466345.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_off00006526.bin
d272452164bca1c9e6da3407b3c68f45038fab7212b8492c33dfaf0f1d4c73e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6526 7680 bytes