Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5b03ddc14edad7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 14:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c3af9853a9511afe8cf72bda5a5a0f3 SHA-1: 42e4929570b647aa367ee811018a42e09d615ffc SHA-256: 8a5b03ddc14edad79a4c930837f89f4262b824fb5b4da4ce21d97b49b7203057
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=dragon+ball+tap+battle+english PDF link annotation
    • http://cariboohose.com/userfiles/file/narasezogomi.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/42760273224.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/25210546692.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/bikobaxifitave.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a83d1a1f0a---xudopisosilozedefavexaw.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/9187944571.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/kidufekawuvene.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/34461531222.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/waguzezodenatapado.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aa37a9d697ebf16e4d1b0b7f3788c851/53986638832.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/kofifinekizefijoj.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/serulomerot.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/71812532356.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/kufina.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210920190214.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/xekevogefumifilavezadeb.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/35249797405.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/jomoso.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/pabexafim.pdfIn PDF document text
    • http://lagrupacio.cat/file/12793269142.pdfIn PDF document text
    • https://architektor.ru/uploads/file/gumonudujazutumonuniduz.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/8520837720.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/19807395545.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/61160703026.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/22195859770.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/finopibijatomonivesofas.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_off0000cf64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF64 10672 bytes
SHA-256: b954cfc70c44d48848bdf798c4ab23394ae7c3e39af8686c41db1d901d85b6bd
font_01_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 19168 bytes
SHA-256: ffb833f936d6563ac97da2026f9c6abcfd751d980e48fefabea3bfff1430d254
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1