Malicious PDF — malware analysis report

Static analysis result for SHA-256 5678e252ed684ce8…

MALICIOUS

PDF

42.5 KB Created: 2020-05-18 08:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 20071d376191e8971d7aa69785ce2ec8 SHA-1: 6259e497ce8ab62fdd178e74fe7f1795ea56084d SHA-256: 5678e252ed684ce89abbda0d22fe69507c9744e3b7a758e900d6cd333cb899b8
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, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains references to 'Cambridge ielts 2 reading test 3 answers' and authoring information, suggesting a lure to educational content. The primary attack pattern involves directing users to a network of suspicious URLs hosted on various domains.

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://gregjiel.com/uploads/1/3/1/3/131383820/131383820.html#cambridge+ielts+2+reading+test+3+answers PDF link annotation
    • http://thequailsnest.com/uploads/1/3/0/4/130488320/941649.pdfIn PDF document text
    • http://riverviewfamilydentist.com/uploads/1/3/0/6/130621646/4312925.pdfIn PDF document text
    • http://tierversuchsfreie-schoenheitspflege.net/uploads/1/3/0/3/130323894/363f788f69ce.pdfIn PDF document text
    • http://rosswooddesigns.com/uploads/1/3/0/3/130313415/3cd7d5fb2.pdfIn PDF document text
    • http://themadfashion.nyc/uploads/1/3/1/3/131398123/aa0325d.pdfIn PDF document text
    • http://risingrebelclothing.com/uploads/1/3/1/8/131871605/2527190.pdfIn PDF document text
    • http://keepoaklandqueer.com/uploads/1/3/0/7/130775817/ebb50.pdfIn PDF document text
    • http://sanctuaryelectrical.com/uploads/1/3/0/7/130739150/lizoduweb-sikowiwal-niwozir-ninavuv.pdfIn PDF document text
    • http://festivalofgoodhumans.com/uploads/1/3/0/5/130551450/9b77742874dae.pdfIn PDF document text
    • http://truemeasurellc.net/uploads/1/3/0/5/130589010/7336158.pdfIn PDF document text
    • http://russhutchison.com/uploads/1/3/1/3/131383604/6264815.pdfIn PDF document text
    • http://sophiaisabellablog.com/uploads/1/3/1/4/131437291/81e5c1d.pdfIn PDF document text
    • http://taekwondobarbados.com/uploads/1/3/1/1/131164531/66c5c8cec4fab7b.pdfIn PDF document text
    • http://atelierlemounou.com/uploads/1/3/1/4/131407711/wuliradekadumon-bokasam.pdfIn PDF document text
    • http://thevinylruby.org/uploads/1/3/0/8/130874629/wamojanosufura.pdfIn PDF document text
    • http://infosysdreamtravel.com/uploads/1/3/1/3/131379031/584f6bda869a1ab.pdfIn PDF document text
    • http://innofoil.ch/uploads/1/3/0/5/130589385/6cf1d0b8c7bd.pdfIn PDF document text
    • http://mohamoudegal.com/uploads/1/3/1/6/131637919/2046649.pdfIn PDF document text
    • http://themotorcyclelounge.com/uploads/1/3/1/1/131164032/4796115.pdfIn PDF document text
    • http://ddiamondco.com/uploads/1/3/1/3/131384602/fojexidox_fasamakovad.pdfIn PDF document text
    • http://dilsavergroup.com/uploads/1/3/1/1/131164558/275dd73a44a9e.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 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_off00007bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC0 10092 bytes
SHA-256: a297d403e2b18559ae95432a0bfbd372bed1ca8e5174287703e9aae48ec3178d

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