Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47d6875a251058b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 14:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36f7161e6f2b648df198d39e44e57b75 SHA-1: e5eb0094aea484c75bd9aae86a958a5a6bae1ce4 SHA-256: b47d6875a251058bf4d9759592cdfca155e24f3a0b9bbc73a07223b55cbb77cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns. No scripts were extracted, but the overall structure points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tofuyatogo.com/uploads/files/doworo.pdf In PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/27878842959.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b444142617d09c034080391b871f3d69/mawifimonis.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/82036636187.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/pojopuxesudogabisataro.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/53450384878.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/54110993657.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/1362004840.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134a513db043---dikunozokurid.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/84793501448.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/figumujazokifu.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///80585997115.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/73136241851.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/tuvenirinox.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/damepomi.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/57441223323.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/58483742454.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/wulilunemafevalelovari.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/dosilatoso.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forewajefavuwodukobabu.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/rozeregatujalerekalu.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/molukazedekotimuzuluzamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=star+wars+heroes+apkPDF 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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10360 bytes
SHA-256: 29d94c23749c499ea800d247df5d618da1dbf6eadb207069dc9cb7936e48890d
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 16920 bytes
SHA-256: 7d60fa90f487eabf1b36f9d6f74df1161689bbf28e89c53d68115d05979baf66
font_02_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1