Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c18c919f1914ba…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 07:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95484a8e5e3eb132f597548f5809cc3f SHA-1: 6622a7dc071c5ae182e324040f82e10e186e4428 SHA-256: c4c18c919f1914ba66dc2620bd93571bbaad91395f9a00deed7dd40784a3c9dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the true destination or host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cmuniontravel.com/userfiles/file/79498038650.pdf In PDF document text
    • http://akicgiyim.com/userfiles/file/danetawarubopisu.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/wesuluxogiwadomikewek.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/76819190705.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/pofusegemebimenus.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/dozexewikowugez.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/nifosula.pdfIn PDF document text
    • http://remobudostol.pl/pliki/59109471259.pdfIn PDF document text
    • http://webursitet.org/Files/file/89827998200.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/93564038628.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/42291176171.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/633dc42ccd5520b29362f6f789ed65db/87399059567.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/mavamuno.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/lofijujafodukitomebilo.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/xefowinosozezisatas.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/webeziresomupusizipesa.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/78867701725.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/kikajituxemixarubagab.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/zetemapagexudiranapaj.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549c61863a---wivoneluzitexomafutovu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/69053081620.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/14363233770.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/90558590564.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109041657298909.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/veruwiwitunutinuxibapisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=seo+keyword+checkerPDF 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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 10164 bytes
SHA-256: 1705c241b21526ee7f3f794f630a942dde6d5508d72301dcbedebc66d4a96b0b
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 19176 bytes
SHA-256: 617f3cbfb0bb34bff7c9b68c9017785b34282374cfdf129f5ae67d223e7e2dd8