Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2cd0b1690487cd…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 19:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e34ca3e651f09d54d075012c23e9149 SHA-1: 6ba7fef45d8fa75016c7571279aa2ca2f39559d8 SHA-256: ea2cd0b1690487cd3294b75888be822d1fa60101d28a8545801ada7c415dd456
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to facilitate further compromise through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coretry.ru/uplcv?utm_term=free+roblox+group+with+funds+generator PDF link annotation
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loxer.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/voxasikebixepu.pdfIn PDF document text
    • http://gewald.ru/content/Files/jopifoxizaxuvafizefotevul.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/67698974394.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/widipeditikewepifu.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/guboranakusuvevopokub.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/fobovozipoluguvapujo.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/zipovolaxozajunidugabeset.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/fukeguxabujugenunu.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/zogibipolorapirif.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/58606440084.pdfIn PDF document text
    • https://podimercrm.com/img/files/nojitumil.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/bomonunedazugumoluti.pdfIn PDF document text
    • http://protok.pro/upload/files/xamokefepot.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/33650588172.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/dogamibixetesor.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/ritositomepesirenakusol.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/58663407693.pdfIn PDF document text
    • https://soechi.id/userfiles/file/9210269531.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/80428238162.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/29484552079.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/lesogujef.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d59e83edae9f9b00c1d570b7c23265e/danitesaduniwo.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/sutivuvutil.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/61689774568.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/kelukupuwalazasuja.pdfIn PDF document text
    • 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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 17960 bytes
SHA-256: e421dcbadd2b342e09fa712c30b09956dbd9c1daf1fc6ce02955e42c5da3284f
font_01_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 11180 bytes
SHA-256: f4e12016b6af916f4329d63e4bb04e28228e03d553a21c928532bbbabadca2e8
font_02_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1