Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf590cc26384e7a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-24 04:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff4b5b8424b6d9dffb7bb86240d22448 SHA-1: b3e0624f9cf4deeffac9230ef6883ea01579ecce SHA-256: cbf590cc26384e7a7fe05d5e5c0895179b781114aa7ee5e4ee424576afa6e148
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, many pointing to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ansing.nl/userfiles/file/41218940536.pdf In PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/71548162981.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/48691902257.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xatalen.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/tekopimavoxabumofel.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/14696795715.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/tetifoxibo.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/18297829514.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b312a95ea4e43d6255db54ec995df88b/32709270641.pdfIn PDF document text
    • http://paradoxine.com/upload/files/48577312398.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021991250205215.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/wozivumupenareruzumu.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/renesefufejupakas.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/parupodemalipaxuvobo.pdfIn PDF document text
    • https://windsbs.biz/files/file/3496772834.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/3757447270.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/83064253326.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/jexuk.pdfIn PDF document text
    • https://upaspor.com/resimler/files/72026669604.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/wetopupemilobepolexana.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/34151996235.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/45422137643.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/zusizipul.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/17768557151.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/13448489596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+cheat+my+tom+2PDF 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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 18852 bytes
SHA-256: 2c5f26a026b3dff3c63e218f30394f29d221f8e6eaca1254494ab7a673b146dd
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 10596 bytes
SHA-256: c7a3572d2dd7990d63b2af1939ee6a927fd1ae6d57d4c03fafe9757c7dc70ca4