Malicious PDF — malware analysis report

Static analysis result for SHA-256 391df25c0be95a42…

MALICIOUS

PDF

45.7 KB Created: 2020-03-08 10:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3b96819799a5b27ac567c21e9a833cc SHA-1: 52d03ae4eef74c1b1bf78ddb6db04ca178f4cd4a SHA-256: 391df25c0be95a42efedf01de7e3a96e050eaaae8e70f1b0249936b2673a385c
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to a multitude of other PDF documents hosted across various domains, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

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://nobumarbella.devsite-1.com/uploads/1/3/0/8/130813957/130813957.html#left+brachial+vein+dvt+icd+10
    • http://data-informed.com.au/uploads/1/3/0/2/130291350/tevobilasebeto_nunojad_kazozig.pdf
    • http://clinicalsupervisionmsw.com/uploads/1/3/0/4/130479513/5191343.pdf
    • http://minijarts.com/uploads/1/3/0/8/130814020/5547410.pdf
    • http://heimebakst.com/uploads/1/3/0/9/130969164/25842.pdf
    • http://emppropertysolutions.com/uploads/1/3/0/5/130589302/9364296.pdf
    • http://livestockin.com/uploads/1/3/0/6/130620317/3652705.pdf
    • http://heatherdvorak.com/uploads/1/3/0/7/130740133/5817166.pdf
    • http://007bondband.com/uploads/1/3/0/2/130272319/5352928.pdf
    • http://ukiahrvpark.com/uploads/1/3/0/2/130272644/6a00b86495.pdf
    • http://beingsemprendedores.com/uploads/1/3/0/3/130313271/kavefufemonor.pdf
    • http://mypersonalalchemist.com/uploads/1/3/0/6/130604653/jenozag-bugukuxalep.pdf
    • http://quitsaconstruction.com/uploads/1/3/0/9/130968962/wigiduram_gejuxugi.pdf
    • http://localizegps.com/uploads/1/3/0/8/130814248/8682929.pdf
    • http://larkappella.com/uploads/1/3/0/5/130539218/6133699.pdf
    • http://swaynami.com/uploads/1/3/0/4/130435947/vuwibutep.pdf
    • http://howtogeekblogs.com/uploads/1/3/0/7/130775510/057423cef16531.pdf
    • http://savecannabis.us/uploads/1/3/0/2/130272976/3902784.pdf
    • http://shc-ilc.hct.ac.ae/uploads/1/3/0/6/130621210/de1ce05ecb3460.pdf
    • http://texanwood.net/uploads/1/3/0/6/130639266/kagepizadavafonatod.pdf
    • http://muttsearmitts.com/uploads/1/3/0/7/130739462/6436334.pdf
    • http://willdraftsmen.org/uploads/1/3/0/6/130620233/zowugufegiko.pdf
    • http://jrmfash.com/uploads/1/3/0/6/130639444/8824015.pdf
    • http://clearhrsolutionsd.com/uploads/1/3/0/5/130588716/fabilo-laxodep-fafoni-tuxiv.pdf
    • http://savethedaycorp.com/uploads/1/3/0/8/130814017/43437.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_off00008aec.bin
3deb557892837a4bed13308e94dc0f55ba4d38ff09cdb644423abf66b365507e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEC 7784 bytes

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