Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b22e0bb68e055e5…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 12:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c06dc2b725774f006d1b9deac285755 SHA-1: 95870869344bf200b497d96959f253be7d286117 SHA-256: 4b22e0bb68e055e5d70b0f3b5e8cafac1bbd403b39a89dfbe93a04052ed526ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable or unknown domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ezastupitelstvo.sk/editor_uploads/system/files/tatemopixedale.pdf In PDF document text
    • https://mygrind.ie/userfiles/file/jezofusejisep.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/zonuwugutun.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/bodezepematu.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/26969143104.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/52346571449.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614403eca0774---tavuralakibunafapiza.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/sunuzusogute.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/komonusef.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/1192603379.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/44367867806.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/18143762893.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/95720640512.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/rujav.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3fc5ce62---pazurufonumu.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/bajomowumutijubavukazelom.pdfIn PDF document text
    • http://kco.su/userfiles/file/86031869108.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/lomikatofejom.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/51600406920.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/lutojimobivopewupabilepul.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/rajesuzasupofijufanuwu.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/lekakotuja.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/31918885857.pdfIn PDF document text
    • http://a899.net/userfiles/file/ludaparilesaxukadegusojes.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/99723338900.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/fapas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=apps+opening+automatically+in+androidPDF 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_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 18556 bytes
SHA-256: c228f52555f45ed6699be86729725dc2fc1cffed568d15ed7baaf5e0253a8084
font_02_sfnt_off000135aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 11052 bytes
SHA-256: caf8a1e0467777c50769d65492bd8f35ffd6271b4fddf0175d1059f574f50c0e