Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae2e222e3abf750…

MALICIOUS

PDF

88.5 KB Created: 2021-10-09 10:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2ffd5d9645842568bd4842622b81e4a8 SHA-1: 8c20f13fb2eaaa7b35b17578cec0919a5ddde903 SHA-256: 5ae2e222e3abf750804abee9db780ded8a957ed1b89ce4f7a364e97b41eee487
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=a+dull+day PDF link annotation
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134796fae77c---20064091298.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/4878320546.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/bamufolisiju.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/77707698947.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/61051604899.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/zexideluvafenex.pdfIn PDF document text
    • http://klinok-saintp.ru/files/80474446554.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/47594231949.pdfIn PDF document text
    • http://rippa.pt/files/file/bukijovetavadugosob.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/34762952764.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210920085045.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/zupelexoxopabegate.pdfIn PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/99192658000.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/46cb4bdb3b2018d29c209ec877f38c42/viboki.pdfIn PDF document text
    • https://laps.pl/userfiles/file/wavalokakuxozerir.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/38236246770.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/92203564273.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-10-4/20211004182129473131.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/41943397966.pdfIn PDF document text
    • http://dgkno.cn/upload/duxibegikuxejosewekibe.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/nozekewizufuwolika.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/81717686242.pdfIn PDF document text
    • http://tulga.ru/editor/files/janadutidoxokikirakarofif.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_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 18000 bytes
SHA-256: bf5f42d0b31517a4000689dc5e0edb395f51fe7848046cc61115ff8734bbc976
font_01_sfnt_off000127f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 9624 bytes
SHA-256: aeb4604ffecd89860983a3bcf033357171a4fa88166bda03de0f3833870edb2b
font_02_sfnt_off00013ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1