Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04d3d8f7863bce6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 03:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 792e405f8cb558ccd9542163151c7adc SHA-1: 62ed36ce63214f8373377bdb9ee6ddbd47ca25e6 SHA-256: d04d3d8f7863bce60523e0935b812309d51f7d8ff208b9553518779418e83eea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67d94e8b3---kifokadugovorazibozekapum.pdf In PDF document text
    • https://tedesco.pl/userfiles/file/17247454525.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/jurilabubipopixuza.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/gokatigirow.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/62082832450.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/wotidisevuwijulijuwevuto.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/taburar.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/jofasixaluvove.pdfIn PDF document text
    • http://artospace.com/pics/file/boful.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/51192706462.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mepefakifusap.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/86366823823.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/mokijo.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/dagumigeteritosit.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/xedoxozibuxe.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/daraditozimakebe.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/pokiwiz.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/93014150617.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/2340730341.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/nuxelozorozub.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/8746149571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+running+training+appPDF 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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 10300 bytes
SHA-256: 91a37a447a5eacdc91d47d90e0fc7ba1dfb71cc81ef5260f4feb68b0702a86c0
font_02_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 17548 bytes
SHA-256: b16bb2503632b69c4ad5f453feb5551c7c3020201a7c999ffb67e4ca9b9bfdb9

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