Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef82e8efbb5b20e…

MALICIOUS

PDF

36.6 KB Created: 2020-06-03 14:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbb7ff3124ee29c237a59541148d90d4 SHA-1: 7284460cf7601a908de1cb454e9e62e99683a5a0 SHA-256: 5ef82e8efbb5b20ec1397d18e2c1a6fb2ff7467649a352c49e377afcb45e41b7
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, suggesting a link farm or a mechanism to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous unknown reputation URLs indicates a high likelihood of malicious intent, possibly involving the hosting of further attack stages or phishing content.

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://admin.mosaicasd.com/uploads/1/3/1/3/131398254/131398254.html#pablo+skywalkin+age
    • http://mobilemechanicbasildon.com/uploads/1/3/2/3/132303027/988f4686a.pdf
    • http://mail.commongroundpg.com/uploads/1/3/0/6/130621206/relasoxilupeliliz.pdf
    • http://eduardoparedescrespo.com/uploads/1/3/0/7/130775837/6946885.pdf
    • http://hewittadvisorygroup.com/uploads/1/3/0/5/130551839/monotologineve-dejufowu-fefira.pdf
    • http://tntpowerhitting.com/uploads/1/3/0/6/130621455/1dc7d52.pdf
    • http://mail.ivsaluki.com/uploads/1/3/0/9/130969426/lididuzejulo_dijoneninalo_lakiwa_nofig.pdf
    • http://blueraingutter.com/uploads/1/3/0/4/130488445/sotijor.pdf
    • http://yourcareercollaborator.com/uploads/1/3/1/8/131856567/punupekexav-levunopokur-posikekib.pdf
    • http://paragonhs.co.nz/uploads/1/3/1/0/131070237/vupamupelulitepi.pdf
    • http://admin.mosaicasd.com/uploads/1/3/1/3/131398254/terms.html
    • http://admin.mosaicasd.com/uploads/1/3/1/3/131398254/dmca.html
    • http://admin.mosaicasd.com/uploads/1/3/1/3/131398254/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dekaxun.files.wordpress.com/2020/05/18792089348.pdf
    • https://gupadolajiwu.files.wordpress.com/2020/05/nubovuximi.pdf
    • https://lenomem.files.wordpress.com/2020/05/3883507056.pdf
    • https://dakemevodugu.files.wordpress.com/2020/05/jonojiwanotodaporakiku.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_off000061d9.bin
331fe28a97891f499999dff283125549cd47e8a2e8f5c89833aa8742c452a8a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D9 10884 bytes