Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f451c4c29da477…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 14:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4539ef090797ca28f26694b29c9d4a6 SHA-1: 1f302f425c43cf074e0a157b12011472b1ff4a95 SHA-256: b2f451c4c29da477e82503a5e6fdbbf3fa1061219fb685db0483753c8b912f0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to distribute or link to other malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.drivingschool-brno.cz/files/files/xozaniminasavibumos.pdf In PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/3004717650.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/67928689946.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/89014076270.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/97205191621.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/jifevorotulibulupawe.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/39929305786.pdfIn PDF document text
    • https://renewone.de/files/93717336341.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/pesolarutetadulaponalab.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/27383014002.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8e8cfcd8d6231a0edca6cf52a6606612/45294514691.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/98539194948.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/42005214782.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/dojilokero.pdfIn PDF document text
    • https://ckv-siemreap.org/ckfinder/userfiles/files/45069026570.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/49020911390.pdfIn PDF document text
    • http://101balkon.ru/upload/files/22145622889.pdfIn PDF document text
    • http://mq-water.net/upload/86875528595.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/28528227384.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/komad.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210909_F9926F739AABC05D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=spider+man+ultimate+power+mod+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_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 10736 bytes
SHA-256: 7bc11a8b981eb7385922846f682c6c1a8233fedbf6aae5335420876756e12687
font_02_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 17960 bytes
SHA-256: 4c5d91c22137f631e96738cce600261d8530752db035ecf832c13d84929e1cc3

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