Malicious PDF — malware analysis report

Static analysis result for SHA-256 306083acb3a3791b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-10 03:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9f99bb7195e03baa5c0f5e7986540a6 SHA-1: 416c679f39e3ae97cbe175e0f0a253268c6763ab SHA-256: 306083acb3a3791bb952cb46138b33ea42e449242acdf17a8657a97b551dd869
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and appear to form a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bakefruit.com/uploads/files/202109062132476027.pdf In PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nuvivuwun.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/voxirebezawij.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/gopukot.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/53322603511.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/36505813726.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/jitupomunevakageme.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/sulakemulavix.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/16791963576.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/92546563361.pdfIn PDF document text
    • https://mimpidia.com/contents/files/digirowub.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/94026472993.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/xojisatoba.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e675b32a---winet.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/virivowusodojolemup.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/jurejugubuloraw.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/nitudemosekepojowifuxaxer.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/kotebekili.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dd47673c1d1993dfd6ad88e453fb9b0a/gegatuw.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/wawuvobekanadafadopo.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kawodi.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/45295957438.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kuzesujoxuwusub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+listview+item+click+new+activityPDF link annotation
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC093 22924 bytes
SHA-256: 7ff837a14dcc6d5775d00b249ae306f8f5a22d9e9f55be8b478822459f56cf38
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 10868 bytes
SHA-256: 105c957f35f5fcc09940c467d8b2a1d8468001774d512ad207c682ad60ddc38b

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