Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0d3f4af830f77e…

MALICIOUS

PDF

35.0 KB Created: 2020-03-26 13:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9b54eeff6298bf7af394d715b4841fc3 SHA-1: cff4dc86bc93e3785bb4dfdfabc3e0a70f48af02 SHA-256: 7a0d3f4af830f77e879c8ce688d8598efa42b19612584461b580ba81cce09a7e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict, and the PDF structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful sites.

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://inthefield.us/uploads/1/3/0/8/130813738/130813738.html#dibujos+de+contaminaci%C3%B3n+ambiental+para+colorear
    • http://mx.plentygoodfarm.com/uploads/1/3/0/8/130814219/gemugefemetakod.pdf
    • http://historicreplicawindows.com/uploads/1/3/0/4/130476830/4029785.pdf
    • http://www.proformancecombatsportsgear.com/uploads/1/3/0/4/130477252/vaxememo.pdf
    • http://premierfamilyphysicians.com/uploads/1/3/1/0/131070498/geselexifu.pdf
    • http://03usr.dtmgt.com/uploads/1/3/0/5/130543121/tokagodobavezo.pdf
    • http://lavahouse.club/uploads/1/3/0/4/130436163/bojagur-naxajegot-tewutaxasakofo-tininemo.pdf
    • http://cashmerecanada.ca/uploads/1/3/0/4/130476523/3fa8ba.pdf
    • http://adsl-65-71-85-41.lawsnakard.com/uploads/1/3/0/6/130639412/zagibobekagejekod.pdf
    • http://www.littlecubsfamilydaycare.com/uploads/1/3/0/3/130323251/tidewalebipotipes.pdf
    • http://stagetrixstore.com/uploads/1/3/0/7/130774973/8867493.pdf
    • http://money4real.org/uploads/1/3/0/6/130621307/domobuli.pdf
    • http://riderwilliams.com/uploads/1/3/0/4/130489727/3218069.pdf
    • http://aggint.com/uploads/1/3/0/4/130476346/47036.pdf
    • http://sugar-studio-ct.com/uploads/1/3/0/9/130969593/winadi_kisag_lovalasegogur_komud.pdf
    • http://constancehsb.com/uploads/1/3/0/8/130813095/filavomeje.pdf
    • http://mymeemli.com/uploads/1/3/1/0/131070131/ad5e2a7d33677.pdf
    • http://www.twindixguitars.com/uploads/1/3/0/6/130604505/xazogi.pdf
    • http://larrylovescannabis.com/uploads/1/3/0/6/130639143/kagupugasujotelibam.pdf
    • http://255402956757559267.com/uploads/1/3/0/4/130488087/wusipumabu.pdf
    • http://f-sec.org/uploads/1/3/0/5/130590578/rafomidukejipavaxawu.pdf
    • http://guerassalsas.shop/uploads/1/3/0/6/130639386/9178858.pdf
    • http://theadcast.com/uploads/1/3/0/2/130273913/4bf0e1d471f29.pdf
    • http://thecannabiscusine.com/uploads/1/3/0/6/130604836/gabopifoguwij.pdf
    • http://anniemelton.com/uploads/1/3/0/3/130313177/zetisiwa_jodojejegoj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef0.bin
5388557e2e5d925cd5111e7ed1918a8485cc794ca71a3f4b7cf88bb3b07c4399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 7736 bytes

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