Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fee5c6af0d13e9…

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 10:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2666eb5b935712b811f1e81db4812fe6 SHA-1: 7986656efe48e53d047cda5264fe61ea22b1598b SHA-256: 88fee5c6af0d13e9ff37dde02f354233bc5a6165f2bc3e12a5d530d4bc018ea0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/gowapuzujawenolof.pdf In PDF document text
    • http://moretonassets.net/userfiles/42300932773.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/24691026134.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/zufevokibaxejavuv.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/58687241078.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/moxiduvigowa.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/xetepo.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/bopimaragemudilum.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/14754565196.pdfIn PDF document text
    • http://agrion.org/upload/fichier/zedelifoxazewi.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jodagazolomowi.pdfIn PDF document text
    • http://datatalk.ilvzhou.com/upload/files/2021/09/202109032223088201.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139004dc1ef8---36405847580.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/71653584829.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/50310366005.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/mejuzuv.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/18434975270.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/bunozenipugaga.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/44208208141.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/8387459115.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/71010567963.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/17847274974.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tixuzezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=happymod+ios+apk+downloadPDF 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_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 17348 bytes
SHA-256: 3aee893a460aede06b0f9a3ee44e15cd4254255b47b079c60512cf334a087531
font_01_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11835 10504 bytes
SHA-256: 604946c17f4d413b506e90e32122ca4710b37d4592f4604e99a087b16b397c81