Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafa8d4724293a4a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 17:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5d53ecaa1a9e081a917b557e5dabb8e SHA-1: 1919fcecefce2890b4837dc432362fec6b11c9b8 SHA-256: aafa8d4724293a4a1d6c9e52d7f94ebb29799ee6eb9f690a1ff720c20b9a0376
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the ML classification strongly indicate a phishing or malware distribution attempt.

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 https://queure.ru/uplcv?utm_term=watch+wonder+woman+1984+watch+online+free PDF link annotation
    • https://marcuspietrek.de/MARCUS/files/file/44209167397.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/22099275264.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/42540167799.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/14479099031.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/60405681910.pdfIn PDF document text
    • https://hsse.cl/files/moferavaruzimo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa6ed68ba---61112570530.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/72666553662.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/laruvo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/57382117205.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8e83688a---70887062136.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/dofoniropopexefogiruseta.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/40941959713.pdfIn PDF document text
    • http://rinsacars.com/files/others/12775102444.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/rapubesovimeramuzizaze.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/9274432788.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/76056133800.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/82131271799.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/1841275389.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/jopoxozebezofef.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2111865796.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/83131730282.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/xevebedozuninoliduf.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/93534864670.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_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 11156 bytes
SHA-256: 1b696d0a6beba3e9db1512283ed41381b6b4755382eaa16a27c75afea1e933c4
font_01_sfnt_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 18124 bytes
SHA-256: ea21af2a768a3f6882818cfa7fb0ae6f69e28fea935e355cbdd8dd88880e6999
font_02_sfnt_off00012db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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