Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a2fe5e5369dd79…

MALICIOUS

PDF

44.4 KB Created: 2020-05-21 21:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67e8438f2dc6bd88e918bdeb88f2082d SHA-1: a21b71795964bfca1bbbbf143384284098b5f44f SHA-256: 61a2fe5e5369dd79e5f1dd5d0548816879bb03a75e90fbfb8fdff5f7c821f247
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a malicious lure, specifically employing a 'Browser extension / update installation lure' and a 'Visual download / call-to-action button lure'. It contains a large number of external links, suggesting a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document likely aims to trick the user into downloading and installing a malicious browser extension or update, which could then lead to credential theft or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stanfordinnanaheim.devsite-1.com/uploads/1/3/0/5/130544694/130544694.html#ultrasurf+eklenti+chrome
    • http://kkconsultants.org/uploads/1/3/0/6/130621532/fca0c342f931.pdf
    • http://electricmultiverse.com/uploads/1/3/1/4/131437669/gusegumikosodiwe.pdf
    • http://ixtusins.com/uploads/1/3/1/0/131070539/3344053edd62dc.pdf
    • http://robinosos.com/uploads/1/3/0/3/130379959/1dd5907fff2c.pdf
    • http://celebratingourseniors.org/uploads/1/3/1/4/131406717/b66818c26d0.pdf
    • http://fredericknational.org/uploads/1/3/0/2/130273766/c5126ce2.pdf
    • http://ashershealth.com/uploads/1/3/0/9/130969407/zogakexafevibi-nevizojes.pdf
    • http://marsheets.com/uploads/1/3/1/4/131438682/7677539.pdf
    • http://benzunhinged.net/uploads/1/3/0/6/130639766/8f64706.pdf
    • http://teknakloni.com/uploads/1/3/0/6/130621592/bixexawet.pdf
    • http://bronwynkirk.com/uploads/1/3/1/3/131381241/bisomuze.pdf
    • http://hibina.com/uploads/1/3/0/8/130874397/e1bdad6444.pdf
    • http://forge-x.media/uploads/1/3/0/6/130604456/japujavames.pdf
    • http://russellalexanderadvisors.com/uploads/1/3/0/4/130435955/ff41657797d164a.pdf
    • http://mosaicapro.com/uploads/1/3/0/6/130604543/wekeraduzobazaf.pdf
    • http://speckledsocial.com/uploads/1/3/1/6/131607063/ruzome-bepafekabokukuw-sevukunomanedu.pdf
    • http://bombardierrealestate.com/uploads/1/3/0/3/130323161/4503708.pdf
    • http://valhallabell.com/uploads/1/3/1/3/131384555/nasexeveboboj-bovot.pdf
    • http://deercreekarchery.com/uploads/1/3/1/6/131606670/3672520.pdf
    • http://seedlingscorps.org/uploads/1/3/0/8/130874165/3ffdc774b.pdf
    • http://watchmedie.org/uploads/1/3/0/2/130289676/luvetupoguwujafadu.pdf
    • http://tastemakersmarket.com/uploads/1/3/0/3/130313427/bemumeza.pdf
    • http://organizemychaos32960.com/uploads/1/3/0/7/130738765/7810785.pdf
    • http://adriennedobbs.com/uploads/1/3/0/2/130288318/labamimonekepi-fobasunep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c3a.bin
892ed3fcb67cc92c203b9a86e09c4445e0b5af55ac9749b313d1cb44b10986b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3A 12276 bytes

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