Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c81a1f66cec496…

MALICIOUS

PDF

39.1 KB Created: 2020-03-17 04:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 6f647cba46f2bf83109c7e3b0aed3616 SHA-1: 3461e93c34eefbc71a219c73604e1bfa5a85545b SHA-256: e3c81a1f66cec49633a52c8cd9bcadf1ac3c0aa34a40d072f1794184bafb091a
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 pointing to other PDF files across numerous domains. This technique is often used for SEO manipulation or to distribute malicious content through a link farm. No scripts were extracted, and the document body content is heavily obfuscated, limiting further analysis of the specific lure.

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://brandstormpromotions.net/uploads/1/3/0/4/130489423/130489423.html#syllabus+uaeh+alumno+servidor+1 PDF link annotation
    • http://glennsuggests.com/uploads/1/3/0/6/130620928/3272508.pdfIn PDF document text
    • http://dolonlearningresources.com/uploads/1/3/0/5/130541272/5256933.pdfIn PDF document text
    • http://www.curvaceouscoutureweddingdress.com/uploads/1/3/0/2/130291572/kuwozezij-kibewemi.pdfIn PDF document text
    • http://chilliexplorer.com/uploads/1/3/0/8/130814286/rolowewuko_namediwewelem_moviwuzefese_tagikafipofa.pdfIn PDF document text
    • http://gastoniapestpros.com/uploads/1/3/0/2/130291786/4755900.pdfIn PDF document text
    • http://www.aa7designworkshop.com/uploads/1/3/0/6/130639177/1339825.pdfIn PDF document text
    • http://donotpanicitsorganic.com/uploads/1/3/0/5/130590339/096c6df18832.pdfIn PDF document text
    • http://www.ctcpuertomaldonado.com/uploads/1/3/0/6/130604692/balopikix.pdfIn PDF document text
    • http://mmtaxandfinancial.com/uploads/1/3/0/5/130550888/3c4a6.pdfIn PDF document text
    • http://labratcosmetics.com/uploads/1/3/0/6/130603989/70a337f47.pdfIn PDF document text
    • http://www.datahalos.com/uploads/1/3/0/5/130544191/8865111.pdfIn PDF document text
    • http://lespetitesnatures.net/uploads/1/3/0/4/130483288/4bf197da4f.pdfIn PDF document text
    • http://quantuminstruments.com/uploads/1/3/0/4/130436181/lelewerafudowix-xaribo-zudulex-mulipovajinema.pdfIn PDF document text
    • http://www.ourchildrensfund.com/uploads/1/3/0/5/130588280/danowidelufin.pdfIn PDF document text
    • http://www.markweeksblog.com/uploads/1/3/0/8/130813658/dijoniv-dukedek-giromud-jufumuk.pdfIn PDF document text
    • http://kidneyrecipes.net/uploads/1/3/0/6/130620881/8d3948dc5283.pdfIn PDF document text
    • http://motoringlegaladvice.com/uploads/1/3/0/8/130874011/6866596.pdfIn PDF document text
    • http://joelhawks.com/uploads/1/3/0/7/130776324/zarobufes.pdfIn PDF document text
    • http://ajointvisionllc.com/uploads/1/3/0/3/130313854/zubir.pdfIn PDF document text
    • http://emarketinglabs.com/uploads/1/3/0/3/130323532/42ba0d57e0d8.pdfIn PDF document text
    • http://globaltradematters.net/uploads/1/3/0/7/130739949/vusarera.pdfIn PDF document text
    • http://cigarsandmasonjars.com/uploads/1/3/0/6/130621649/8814612.pdfIn PDF document text
    • http://mail.sibelguruney.com/uploads/1/3/0/3/130313700/kitufebara-gibekusasazaxax-kazufapazebo.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 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_off00006e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E65 8468 bytes
SHA-256: db52a22aef15eb35009ccdca6199333abd1f6da5e0db7b6668ee7b158ca26a4e

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