Malicious PDF — malware analysis report

Static analysis result for SHA-256 233393ac76b8e739…

MALICIOUS

PDF

31.8 KB Created: 2020-03-27 02:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 2b0bb2847d7ea173d036774a7b7f5263 SHA-1: 229339e0dba7d0c803e77e9c00f4cb48f2a2edd1 SHA-256: 233393ac76b8e73921087f3867bfc7fd2c06924bf8e637f492d3079a6e815462
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The document body text is largely unreadable due to encoding issues, but the presence of the URL 'http://johncoulson.com/uploads/1/3/0/4/130492038/130492038.html#numeros+divisibles+entre+3600' suggests a potential lure related to numbers. No scripts were extracted from this sample.

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://johncoulson.com/uploads/1/3/0/4/130492038/130492038.html#numeros+divisibles+entre+3600 PDF link annotation
    • http://kelviron.com/uploads/1/3/0/6/130620612/teluful.pdfIn PDF document text
    • http://qd-hk.net/uploads/1/3/0/4/130478174/4623695.pdfIn PDF document text
    • http://akfnyc.net/uploads/1/3/0/5/130540280/xagazukofemuwilufito.pdfIn PDF document text
    • http://513originals.com/uploads/1/3/0/3/130323318/rarelisawekubati.pdfIn PDF document text
    • http://fllopenlebanon.com/uploads/1/3/0/6/130621470/xerujini-zipafojidum.pdfIn PDF document text
    • http://jones106.com/uploads/1/3/0/5/130588731/6678972.pdfIn PDF document text
    • http://anfieldadvisors.net/uploads/1/3/0/3/130323932/jotelogimuzo-lujalinuwidapol-kilabavoju-dekudife.pdfIn PDF document text
    • http://xxx666xxx.site/uploads/1/3/0/5/130590368/xuwedot.pdfIn PDF document text
    • http://www.svpetandhomecare.com/uploads/1/3/0/3/130379118/3855312.pdfIn PDF document text
    • http://www.helpscottheal.com/uploads/1/3/0/6/130640194/jetuwiwirujug_pezenixowojid.pdfIn PDF document text
    • http://straitcycles.us/uploads/1/3/0/7/130775277/misalarosutavipakeso.pdfIn PDF document text
    • http://marijuanaexchangemarket.com/uploads/1/3/0/7/130776253/taxijaguvanuv-seguti.pdfIn PDF document text
    • http://jamesdunlopmusic.com/uploads/1/3/0/5/130551427/kapolerudu.pdfIn PDF document text
    • http://cpanel.habitatlacrosse.org/uploads/1/3/0/9/130969758/wafonirufuxel.pdfIn PDF document text
    • http://albioncottagebroadstairs.co.uk/uploads/1/3/0/7/130739918/tobuwunulefipu.pdfIn PDF document text
    • http://peoriamfg.com/uploads/1/3/0/4/130477420/tenorubidafonugix.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

Related samples 1

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_off0000552e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x552E 7184 bytes
SHA-256: f0b1c7471456651b509da4996aec78c2cb379f4bbfea43485fa0285ee4c2749b

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