Malicious PDF — malware analysis report

Static analysis result for SHA-256 943eaade31242ce3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 13:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38f97561a7f21874f7b157fa6a690a7f SHA-1: 235541bb1ea6b4762ac44bda4ef84c29247c89d3 SHA-256: 943eaade31242ce3bb57a111b04f6e3f89dd839c60acab4e748fcb3c2a1c99c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, likely to distribute malware or phish for credentials. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to other PDF files on disposable domains, supports the attack pattern of luring users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://novichiha.ru/pic/file/36008736560.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613342ea3d38b---lopivosemixulawovani.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/87932698128.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091006181073499.pdfIn PDF document text
    • https://j26clean.com/upload/files/4948437645.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/58028238533.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/bonuzop.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/14750640539.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/susatopepilo.pdfIn PDF document text
    • https://edex.co/userfiles/files/86096964538.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/5642815257.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/20430853961.pdfIn PDF document text
    • http://kodemari.info/data/files/20633170433.pdfIn PDF document text
    • http://vejwun.cz/images/sorofilix.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/69051536847.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/fujupimizud.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/pawatevutumorekelol.pdfIn PDF document text
    • https://mollis.rs/files/55342579504.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/78184693093.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/biwedutaza.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/74035121108.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8a7d1df997b87ceb06a174ea4d80436f/21198267556.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/fedofujomafutedekex.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/14054021572.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/82273387782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tekken+7+ppsspp+download+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_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10480 bytes
SHA-256: f33df69b02841fbd31cdb83c20cb28d8bcab9b3bfe6240e6f2f9b945699da25b
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 17012 bytes
SHA-256: ebab5c2718a410463ffa5841ba937ce8d69ca9047bde142995db587753ca6727