Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67e8ccf225c5549…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 08:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 211f0578b86b076beef86bf10e9ad82e SHA-1: 7a8df89bd543b5cccd6c29ed926c19e043afa499 SHA-256: e67e8ccf225c5549764a1a6aaf0c84aa7eccfe3d3adce41f02730c9a7c7361e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://chcial.ru/uplcv?utm_term=brian+lara+game+download+for+android', suggests a lure for downloading a game. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=brian+lara+game+download+for+android PDF link annotation
    • http://maslatalaia.com/userfiles/file/19167815979.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/30414690833.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/wexosemu.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/bepefesikiwexuja.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109020437558617.pdfIn PDF document text
    • http://live-net.it/file/39801978061.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/pusirenupagotomagi.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/35349280308.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/mulaf.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141384445af1---93305485360.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091406465072.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/39924996506.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/vevukemoziroruwanak.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/wowatuwezojudejixi.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/90798097559.pdfIn PDF document text
    • https://posh.hr/files/roreririkidojes.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/puvewetimimudigabutiravu.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/63990754635.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fowuvinojavamo.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/remukamoxagujojefejuzax.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vatevasotanamalevolijem.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nelepu.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/40345525009.pdfIn PDF document text
    • http://www.heksan.com.pl/file/75683971618.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/18661451660.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/wukewul.pdfIn PDF document text
    • http://anpo.vn/upload/files/57083338092.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/weziwawitatelosemowobiv.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_off0000c3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 10568 bytes
SHA-256: f8e0233cf93236f38d4f1f8e6254ea11dbc1342aeff83ed36c7d94c37a64b5ff
font_02_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 16508 bytes
SHA-256: 2c9f2eec2569fb79fbb7825e79ab08fa377b259c8dea4a05df6ac570b2bec5d0