Malicious PDF — malware analysis report

Static analysis result for SHA-256 52248678c05b31fd…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 15:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ea88c5f903752f67fe15244c3d21d58 SHA-1: 85b41b5a3fa8dd791c77cdc32e71e7236470cb88 SHA-256: 52248678c05b31fd1b3af9fa4584163cddced0fae78670ba48688e456de18289
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://sibconsulting.com/contents/files/jagex.pdf In PDF document text
    • http://axwelindia.com/uploads/dudiwofosevibu.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/32644674617.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/sifunimanirorebukepov.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/1153176735.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/xifevusasorameg.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/falolilowede.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jazakolivugafarojupifavax.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/jajivunipisumojipogufoze.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/rarukulurizoragubal.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/70383321790.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/kalovalipebogekaziriwu.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/15369314609.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/pidulizosifaritol.pdfIn PDF document text
    • https://12shio3.com/contents/files/lowajedonoberaz.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/fujijukad.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/60803263913.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613773a25e790---61027504212.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da319cb2a7---37389527701.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/73033722625.pdfIn PDF document text
    • https://mbbs.hr/files/22473691471.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/dasitowamu.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/14193638290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+setup+mi+box+4kPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 21084 bytes
SHA-256: faf73100e4cbd8da3ccb8e7cad35d7ec3b524648969a1cb27176da63422bb192
font_02_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 10592 bytes
SHA-256: 3f75624a81be6e9c87cba5166a05ca9b0d290241686a69df83815e73dbf68636
font_03_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137