Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6ea1a1f34c5e4b…

MALICIOUS

PDF

39.8 KB Created: 2020-05-19 12:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 96aa7654b8392decc2cd0d12171ddfc8 SHA-1: 7f570cbcf4d1e3ac7efa27cf8c24ffeb59b0280b SHA-256: 4c6ea1a1f34c5e4be4d2d85ec6767f06145603b05b95108453ced266e02504b3
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body itself is largely unreadable, but the presence of numerous URLs points to a delivery mechanism rather than a legitimate document. No scripts were extracted from this sample.

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://theelfbox.com/uploads/1/3/0/3/130313741/130313741.html#libro+justo+a+tiempo+manoella+wilbaut+pdf PDF link annotation
    • http://dunau.eu/uploads/1/3/0/7/130739462/porukojezubakafop.pdfIn PDF document text
    • http://livingwithmyselfonline.com/uploads/1/3/0/4/130488544/migadunebuwe-zunabolulubelaz-malofob.pdfIn PDF document text
    • http://themshop.us/uploads/1/3/1/4/131454158/67bd781dc60942.pdfIn PDF document text
    • http://johnspencermusic.com/uploads/1/3/0/6/130604056/5864520.pdfIn PDF document text
    • http://tspicey.com/uploads/1/3/0/4/130489448/pirufi.pdfIn PDF document text
    • http://wholesalefuse.com/uploads/1/3/1/4/131406506/c43be.pdfIn PDF document text
    • http://topstitchpro.com/uploads/1/3/0/6/130620185/nirubi.pdfIn PDF document text
    • http://altimetervineyards.com/uploads/1/3/0/8/130874473/4c157359d44b.pdfIn PDF document text
    • http://rohlconsulting.com/uploads/1/3/0/9/130969887/54c34aa67f3.pdfIn PDF document text
    • http://cleancaresupport.org/uploads/1/3/0/7/130740148/3808148.pdfIn PDF document text
    • http://prosperdoc.com/uploads/1/3/1/3/131379598/pimex-temufopul-larunekedo.pdfIn PDF document text
    • http://sosessays.com/uploads/1/3/0/2/130289430/forivakem-namiwirel.pdfIn PDF document text
    • http://wpcg.org/uploads/1/3/0/6/130604388/jisufojigagevivibom.pdfIn PDF document text
    • http://thmservices.net/uploads/1/3/0/7/130775821/puromobed-metaw-saraziwesoj-gabupukedapowus.pdfIn PDF document text
    • http://txsmartlandscape.com/uploads/1/3/0/4/130436020/f991a1a24b137e.pdfIn PDF document text
    • http://zacharydecherd.com/uploads/1/3/0/9/130969555/b8ee3c203a92ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 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_off00006ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA8 12400 bytes
SHA-256: 14cf51e3c4b6a616b7cdf72bed56380771e2ec2ef93ca4d5ee7f079d2958a899

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