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) First seen: 2020-08-25
MD5: fbb7ff3124ee29c237a59541148d90d4 SHA-1: 7284460cf7601a908de1cb454e9e62e99683a5a0 SHA-256: 5ef82e8efbb5b20ec1397d18e2c1a6fb2ff7467649a352c49e377afcb45e41b7
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed stream and a high number of external links, indicating it is part of a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely serve as lures to further compromise the user.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 PDF link annotation
    • http://mobilemechanicbasildon.com/uploads/1/3/2/3/132303027/988f4686a.pdfIn PDF document text
    • http://mail.commongroundpg.com/uploads/1/3/0/6/130621206/relasoxilupeliliz.pdfIn PDF document text
    • http://eduardoparedescrespo.com/uploads/1/3/0/7/130775837/6946885.pdfIn PDF document text
    • http://hewittadvisorygroup.com/uploads/1/3/0/5/130551839/monotologineve-dejufowu-fefira.pdfIn PDF document text
    • http://tntpowerhitting.com/uploads/1/3/0/6/130621455/1dc7d52.pdfIn PDF document text
    • http://mail.ivsaluki.com/uploads/1/3/0/9/130969426/lididuzejulo_dijoneninalo_lakiwa_nofig.pdfIn PDF document text
    • http://blueraingutter.com/uploads/1/3/0/4/130488445/sotijor.pdfIn PDF document text
    • http://yourcareercollaborator.com/uploads/1/3/1/8/131856567/punupekexav-levunopokur-posikekib.pdfIn PDF document text
    • http://paragonhs.co.nz/uploads/1/3/1/0/131070237/vupamupelulitepi.pdfIn PDF document text
    • http://admin.mosaicasd.com/uploads/1/3/1/3/131398254/terms.htmlIn PDF document text
    • http://admin.mosaicasd.com/uploads/1/3/1/3/131398254/dmca.htmlIn PDF document text
    • http://admin.mosaicasd.com/uploads/1/3/1/3/131398254/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dekaxun.files.wordpress.com/2020/05/18792089348.pdfIn PDF document text
    • https://gupadolajiwu.files.wordpress.com/2020/05/nubovuximi.pdfIn PDF document text
    • https://lenomem.files.wordpress.com/2020/05/3883507056.pdfIn PDF document text
    • https://dakemevodugu.files.wordpress.com/2020/05/jonojiwanotodaporakiku.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D9 10884 bytes
SHA-256: 331fe28a97891f499999dff283125549cd47e8a2e8f5c89833aa8742c452a8a5

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