Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6dd090957032ac…

MALICIOUS

PDF

43.0 KB Created: 2020-03-16 17:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 6ac5f5599909b78b4481246a1cbe4d49 SHA-1: 61df2066ae64ec3651533752d81fb6932686184c SHA-256: ef6dd090957032ac9c9a695b0dd8b0d5f716c521a651a266aeb8269c8f3c008d
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, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or redirection scheme. The document body contains garbled text and some URL fragments, but the primary malicious activity appears to be the mass distribution of external links. 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://pencilpenservices.com/uploads/1/3/0/6/130639775/130639775.html#conformado+de+materiales+que+es PDF link annotation
    • http://elreydelaceramica.com/uploads/1/3/1/0/131070452/dujifigal.pdfIn PDF document text
    • http://www.projects.nuenergygroup.com/uploads/1/3/0/7/130739934/tiwobojisuvalodolu.pdfIn PDF document text
    • http://www.puertoricotours.com/uploads/1/3/0/5/130588334/rizifirexaw-jexologado.pdfIn PDF document text
    • http://annesketch.com/uploads/1/3/0/3/130313123/zafomuvanubukip.pdfIn PDF document text
    • http://goldheartpersians.com/uploads/1/3/0/6/130621730/68ec5.pdfIn PDF document text
    • http://becomingpresent.org/uploads/1/3/0/6/130621072/siwiraz-boralobuw-refitami.pdfIn PDF document text
    • http://christopherburge.com/uploads/1/3/0/7/130738543/36b56ee.pdfIn PDF document text
    • http://satnickod.com/uploads/1/3/0/6/130621425/zokumaxon.pdfIn PDF document text
    • http://missouri-nationals.com/uploads/1/3/0/3/130313619/2809823.pdfIn PDF document text
    • http://markrharris.com/uploads/1/3/0/4/130478772/mogitufizoxojuz.pdfIn PDF document text
    • http://www.erikandersoncuisinier.com/uploads/1/3/0/5/130588784/c8b6e80.pdfIn PDF document text
    • http://www.rockymountianmetis.com/uploads/1/3/0/5/130543377/2989008.pdfIn PDF document text
    • http://alniyatbellydance.com/uploads/1/3/0/3/130313235/xazowixe.pdfIn PDF document text
    • http://hostmaster.sportpic.co.il/uploads/1/3/0/5/130588589/2433961.pdfIn PDF document text
    • http://blindcricketaustralia.org/uploads/1/3/0/7/130775109/paroker.pdfIn PDF document text
    • http://thestandguild.com/uploads/1/3/0/5/130588603/3331277.pdfIn PDF document text
    • http://www.ohmygoodnessfarms.com/uploads/1/3/0/4/130436415/lukelakilerasewosim.pdfIn PDF document text
    • http://monsieurcoulibaly.com/uploads/1/3/0/7/130775032/f714a24fcb85f5.pdfIn PDF document text
    • http://mx.publicimagearts.org/uploads/1/3/0/6/130639115/reludepidib-pixujiguseb-tamaxotalajeda-puwuxi.pdfIn PDF document text
    • http://misbirmingham.com/uploads/1/3/0/7/130739232/movobi_godevinasarawo_rirobukadade.pdfIn PDF document text
    • http://mail.discountfireworks.us/uploads/1/3/1/1/131163761/8241063.pdfIn PDF document text
    • http://napaduilawyer.net/uploads/1/3/0/4/130435906/93a2f00539.pdfIn PDF document text
    • http://www.thinkleetutoring.com/uploads/1/3/1/0/131070938/3112343.pdfIn PDF document text
    • http://mail1.kingsheathnationalspiritualistchurch.com/uploads/1/3/0/5/130589104/61c56c07c7.pdfIn PDF document text
    • http://lltraininginstitute.net/uploads/1/3/0/5/130589160/fadodonipaf-dederutowagomi.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_off00007d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5C 8776 bytes
SHA-256: 805f4a5b94916d2aa06c7d1c7c2a82130e09113ecf4a3f64c5bd506fdf426cd9

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