Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b73d6deac9975f…

MALICIOUS

PDF

38.8 KB Created: 2020-03-21 17:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: b82ba90d81c409d962d0c7d32053e8c7 SHA-1: 7f914fa9b1f5bac405292a76a6f4ca4d1ddc3980 SHA-256: c6b73d6deac9975f658275225846ce7d703f760b64094d702be30eece5324f84
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links to various domains, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body, though containing garbled text, includes a reference to 'Actividades de lectura y escritura primero primaria' and the wkhtmltopdf authoring application, suggesting a lure document. The primary attack pattern involves directing users to a link farm of PDF files.

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://charmedcattery.com/uploads/1/3/0/4/130488773/130488773.html#actividades+de+lectura+y+escritura+primero+primaria PDF link annotation
    • http://marinmalumbres.com/uploads/1/3/0/8/130813453/keribofafag.pdfIn PDF document text
    • http://www.stevemossberg.com/uploads/1/3/0/2/130289493/futovizogifurewalo.pdfIn PDF document text
    • http://burlingtonlife.ca/uploads/1/3/0/8/130874680/fokifedixetel.pdfIn PDF document text
    • http://huangguanxianjinwangam8m.br3h.com/uploads/1/3/0/2/130289301/41a586c374a21c9.pdfIn PDF document text
    • http://www.jeromesvintage.club/uploads/1/3/0/8/130814596/tagazi.pdfIn PDF document text
    • http://nextbuildingforum.com/uploads/1/3/0/8/130873856/fezaponetu.pdfIn PDF document text
    • http://www.mastersofreception.com.au/uploads/1/3/0/7/130740092/5e4c7b2a9d3c7.pdfIn PDF document text
    • http://jazzysweettreats.net/uploads/1/3/0/3/130379363/jefojukasilanelup.pdfIn PDF document text
    • http://luxurydaytona.com/uploads/1/3/0/7/130775200/4078012.pdfIn PDF document text
    • http://robynmichaelconsultant.com/uploads/1/3/0/3/130323697/guwigulaxejib-piroxaxorumiw-fifasuv-lonalubajal.pdfIn PDF document text
    • http://girasoulove.com/uploads/1/3/0/5/130590436/vatafasevijoretumi.pdfIn PDF document text
    • http://hostmaster.marthanorman.com/uploads/1/3/0/6/130622036/479946.pdfIn PDF document text
    • http://wainspection.com/uploads/1/3/0/5/130590019/e23045c7ecab66.pdfIn PDF document text
    • http://mail.tedlucas.net/uploads/1/3/0/3/130379062/vazetofekadutab-guvazidetife-vumajinadobeler-rogipumanewol.pdfIn PDF document text
    • http://cook-edu5.com/uploads/1/3/0/5/130551366/sifulusixus.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_off00006cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAB 9304 bytes
SHA-256: f25bd34a1b1fb20dcebf96dce7ce6177894c50dbc0d157b7d2bdb826534c6e18

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