Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d4f6d04ac6e812…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 02:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e09a5a3cd91a91ae1b40776b86a8f386 SHA-1: 86a0f265821934313da7cd6c264c0549f9a1b0ad SHA-256: 12d4f6d04ac6e8123ac7aa8ac6a38e4df4e1e99f080bd5058efce8013a9fdf6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure and external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=dictionary+apk+free+download PDF link annotation
    • http://testplanet.nl/uploads/files/ratidevesediru.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/farorudesu.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/15249486414.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/buboxuxizidodas.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9fcb51439e8fbb6daa2298ed7211639d/nudalupekufevexivupumu.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/kekokepifepiwawej.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/rugexavizin.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/koluwupozefejutama.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23981677943.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/65846957266.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/98482366841.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/15518925584.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/13775631144.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/tiwupubirovapufixovubilof.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/18857751742.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/xusolitusakozituwo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/6239763906.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908134242659753.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/xenogodizojokoz.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/kekiraro.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d44690f3---36436991448.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/10653001559.pdfIn PDF document text
    • http://reopen911.info/media/file/bisawonikibujugesuvuzaji.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/3433922614.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_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 10740 bytes
SHA-256: 2b33cadb28f956f67d4ca385a62d8a2421876546d3f341f7b8af768c691e3c21
font_02_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 18768 bytes
SHA-256: 73daab326456fd4822630dc312c04a202a18bee163c9124964ad3bba2ebeaab0

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