Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4105959efed6acf…

MALICIOUS

PDF

36.3 KB Created: 2020-06-03 21:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 05cf6b88c879a42d78179d996409418d SHA-1: ace0da33df160d1f1e4ee2b003823d6bc0f08c75 SHA-256: d4105959efed6acf252c41f197bbd7f06e60cef55328d67031303fdd9cf06b70
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, many of which point to suspicious domains. The document body, though partially corrupted, contains text suggesting it is a 'math test' ('Prova de matematica') and includes URLs that are likely part of a link farm designed to redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

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://bet365tikuannagezuizhuanye.br3h.com/uploads/1/3/0/6/130620581/130620581.html#prova+de+matematica+3+ano+ensino+fun PDF link annotation
    • http://3eb.undesirable.us/uploads/1/3/0/3/130313274/1f1c56683.pdfIn PDF document text
    • http://turunalexandertekniikka.com/uploads/1/3/0/8/130814788/8072483.pdfIn PDF document text
    • http://intertito.be/uploads/1/3/0/7/130775116/nupimo.pdfIn PDF document text
    • http://ledgehillbeer.com/uploads/1/3/0/6/130621119/e199ec7ee29c3e.pdfIn PDF document text
    • http://begrantwise.com/uploads/1/3/0/4/130483416/6843073.pdfIn PDF document text
    • http://softwareanalytics.biz/uploads/1/3/1/3/131380558/f3203fc62da.pdfIn PDF document text
    • http://embracenfglife.com/uploads/1/3/0/6/130605010/d76c77d343.pdfIn PDF document text
    • http://theartcrafters.com/uploads/1/3/0/8/130813922/nulirajefoxal.pdfIn PDF document text
    • http://powernetgainesville.com/uploads/1/3/0/5/130547038/regiz.pdfIn PDF document text
    • http://bet365tikuannagezuizhuanye.br3h.com/uploads/1/3/0/6/130620581/terms.htmlIn PDF document text
    • http://bet365tikuannagezuizhuanye.br3h.com/uploads/1/3/0/6/130620581/dmca.htmlIn PDF document text
    • http://bet365tikuannagezuizhuanye.br3h.com/uploads/1/3/0/6/130620581/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zosagadepug.files.wordpress.com/2020/05/7917069631.pdfIn PDF document text
    • https://jefimebatagi.files.wordpress.com/2020/05/busonuxekug.pdfIn PDF document text
    • https://zomupomusevo97283690.files.wordpress.com/2020/05/25216098137.pdfIn PDF document text
    • https://zexitisi.files.wordpress.com/2020/06/18478691323.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 2

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_off00005dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC0 12884 bytes
SHA-256: 8f3adc4b2201e675252ce134acfb12d1509f87d17034d0e9a89d44c5298880a3

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