Malicious PDF — malware analysis report

Static analysis result for SHA-256 26324d55d4187ba7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 09:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cc1544d5298b4dd55c24c152c583163 SHA-1: e981f608dcbb7b621b86020ea2bd6f0cd1e05e59 SHA-256: 26324d55d4187ba7c6fc0fee9bfa4ae49fb16990d649c26476467bc0d50e7a1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful content. The presence of embedded URLs suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=mod+apk+rail+rush PDF link annotation
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc72069924---72562968822.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/lajevav.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/nonasurezo.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/desenezawa.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/22320814061.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e3b14e21ab2b2c583639ad514c076687/1804554355.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/68592892312.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/mewusudupoxojo.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/jegeso.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/87036478766.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/dazotujened.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/62206759503.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p1g5ud4nimrnbp4rv7trh6umc6/fuvilajukexobigorezaze.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/kuredovosamigikofojo.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/geguguwej.pdfIn PDF document text
    • http://kaies.net/upfiles/210906161819514254xavgyf.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/41513582944.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/tenufubiketonap.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/83933980149.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/82540651930.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/dopurep.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/rozubuzububebinidupoma.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/juletizogelazinitatake.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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 17064 bytes
SHA-256: 398fee9d18ee856dbf8fff785be279f8f5c7f70bdd3122638fad151669466ba8
font_02_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 10340 bytes
SHA-256: 3e628c4bfc83b44a0c6d84639b7eb8ed7fee16cee8db8aded6d3ba6247bf965a