Malicious PDF — malware analysis report

Static analysis result for SHA-256 0210ae4964bb0469…

MALICIOUS

PDF

70.1 KB Created: 2021-09-19 20:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36549624f56a7b7a21efaca7f6746e9b SHA-1: aac45cdf20ea1095992a47b82152ec74f484ae3b SHA-256: 0210ae4964bb04699058f0496e46a34b69dedb5d620247d19e7d95cb12ad5ced
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or redirects users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. No scripts were extracted, but the presence of external links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=sniper+fury+hack+windows+10+pc PDF link annotation
    • http://studiolorenzino.eu/userfiles/files/40571509479.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109141229059622.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/6883378394.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/51269799665.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/47117544199.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/49993998287.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/megubexifiwarobezuw.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5efd97ed4---bomekilisarasux.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/zigavofonuwujop.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/9340877227.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/namitedekenazosa.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/gozimesezo.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/49102893124.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/05c71207e6903122d6c1505f991818f1/5868083263.pdfIn PDF document text
    • http://thevalleytrader.com/files/12373531001.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/56069667812.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/5437245718.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/zosef.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zaxumibixig.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/58740572075.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_off0000b12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12D 15624 bytes
SHA-256: 8738c4f998747e4c2f24c58da337bf12b5df584d938dba74088bcc0d94af7a3c
font_01_sfnt_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 11212 bytes
SHA-256: b2a64c035919a44efdbd9880e8dca9a3d2c84ec73dd48830dade156d2efcd464