Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71b6240bfc8732e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 04:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6eca7907a8d086b260a85580337ff8dd SHA-1: 6c847851efc88c26f429a5b6c158a377b34a2f33 SHA-256: e71b6240bfc8732ed9a6e964d90acbdd9b27aa0fca6a554e67bc27263b770868
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are likely used to distribute further malicious content or conduct phishing operations. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://ketchas.ru/uplcv?utm_term=how+to+get+photos+from+android+to+ipad PDF link annotation
    • https://rasathantrananotech.com/ckfinder/userfiles/files/22869885702.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/xifofopamunudizazoraj.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/4728971422.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/40605967993.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/sitefigefarawojedurami.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/27664666037.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/kugimiw.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/kaneruvusokemoxurobu.pdfIn PDF document text
    • https://seger.cz/userfiles/file/sofovuviwalitozupenudub.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/59419739550.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/12671492626.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/27403087764.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/delemageronedowozewedaj.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/im07sevq1bulohc8ske2b24to1/3193140776.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/xofij.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/34924172065.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/dunuma.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/dujexadakaxumoxavokaz.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/78974988985.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/54794834327.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/ronugi.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/71134673455.pdfIn PDF document text
    • 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_off0000b0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C3 16216 bytes
SHA-256: 8b7c4c0e2d5c47412da9222e37aff74516d30891396122c54ea5174e85f06017
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 10976 bytes
SHA-256: f5f6f24e575541737f9df2f2443cefa48f2a6a3f8c8d24012426c92e6f96f79c
font_02_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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