Malicious PDF — malware analysis report

Static analysis result for SHA-256 055d232ef95950dd…

MALICIOUS

PDF

43.7 KB Created: 2020-05-01 03:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb101ab215fd30038219a0bc65f068fd SHA-1: 3eb4423b8384235c19119c0aa123237138bb0e9e SHA-256: 055d232ef95950ddaa14e8311b0ee82d6e5b435dcc0564a24c7214fcf66ac70f
136 Risk Score

Malware Insights

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

The PDF document employs a social engineering lure, presenting itself as an 'English learning course pdf' to entice users. It contains a large number of embedded external links, identified as a 'PDF SEO Link Farm', which likely serve to manipulate search engine rankings or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farming and social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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://annotalegal.com/uploads/1/3/1/4/131437535/131437535.html#english+learning+course+pdf
    • http://intothewarm.com/uploads/1/3/0/5/130550683/917415.pdf
    • http://lucid-cube-edu.com/uploads/1/3/0/7/130738658/8594047.pdf
    • http://fpsmateriaiseletricos.com/uploads/1/3/0/4/130436357/8708509.pdf
    • http://bineshdhakal.com/uploads/1/3/0/7/130740222/b16b5ea58.pdf
    • http://lifelitupphotos.com/uploads/1/3/1/3/131381769/3302317.pdf
    • http://areafest.com/uploads/1/3/1/4/131453415/9815704.pdf
    • http://albemarleop.com/uploads/1/3/0/7/130740344/pogibo_wufenunabipeti.pdf
    • http://cristinasacchi.com/uploads/1/3/0/6/130639656/25814.pdf
    • http://triamantdigital.com/uploads/1/3/0/6/130603936/toxob.pdf
    • http://captarmarketing.com/uploads/1/3/0/6/130621276/1864581.pdf
    • http://hecoma.de/uploads/1/3/1/4/131453915/wajakemijo-bujivu.pdf
    • http://resolutiontraining.net/uploads/1/3/0/7/130738501/5177c2df9f3c5a2.pdf
    • http://sludgeface.com/uploads/1/3/0/7/130740262/wafajanimazi.pdf
    • http://gilliaunas.com/uploads/1/3/0/7/130776787/bepojokuwekenew.pdf
    • http://memecuisine.net/uploads/1/3/0/6/130604153/2819994.pdf
    • http://mkcinvestmentsllc.com/uploads/1/3/0/6/130620985/zusiwum.pdf
    • http://thebullandbearreport.com/uploads/1/3/0/8/130813750/pejigofin_gejunisup.pdf
    • http://blueballstudio.com/uploads/1/3/1/4/131453463/9508558.pdf
    • http://vanessavalenciahealing.com/uploads/1/3/0/6/130620317/nefoko_tanolobina_kedul_vuwaxezipopuna.pdf
    • http://toyota-trd-super-power-trd.com/uploads/1/3/0/5/130538981/nudux.pdf
    • http://auctioncincy.com/uploads/1/3/0/3/130313237/3329884.pdf
    • http://trashstashpins.com/uploads/1/3/0/5/130590654/duretobom.pdf
    • http://bolsterrogers.com/uploads/1/3/0/7/130775723/kikewemunovemut_xujugeb_gepaxasadalumew_fofotadifug.pdf
    • http://afieldguidetotheparanormal.net/uploads/1/3/0/6/130621106/soboxeli.pdf
    • http://linuxpos.org/uploads/1/3/0/4/130476339/4348355.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c06.bin
4625d102436d6623ab23da01d83f895eefcffb1ac9bfb8e804e4b48e22ac4469		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C06 7936 bytes
font_01_sfnt_off00008ae3.bin
c6c28444bcd94379862b6cc7f8cfcdbcdaeb026857ccdb099d87626a561054a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE3 16092 bytes

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