Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe8b6aa8cbef6ee…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 20:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88f2ba30ddcd791c0f363d843661c61a SHA-1: 6c111aa1fb73f4883ae0847ca32a1ccd150fbe20 SHA-256: efe8b6aa8cbef6eecfd3d08c305731a0b61cd86e68066294e85695af1828d70b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lure users into clicking links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://semagro-msw.ru/pics/images/file/29733404421.pdf In PDF document text
    • https://dukra.sk/editor_uploads/files/2972054270.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/36914721619.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/69962719691.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/felivolisalaz.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/zafasozeminoruvabizusedu.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/84400151845.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2e8f7c324---vuzazepepumumidenipilarix.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xifigoxopokunadupexoxupo.pdfIn PDF document text
    • http://leguido.net/files/kikunureki.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/33478733332.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/vekawekovefuvusenuzuz.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/72194900592.pdfIn PDF document text
    • https://profm.hu/files/file/15474994590.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/fetamukulenusawuraxebog.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902111953.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/lekejafemigojeselexu.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/gawitijemozovawuxi.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/84646821780.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/49901951603.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/44838589842.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/71147711186.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/ramoduwubivuluselojafowol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watch+telugu+movies+online+websites+freePDF 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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 17272 bytes
SHA-256: 7bf818b3ec208e810d6dea9255300690e68e7be7da84664460a2da364373dc24
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 11168 bytes
SHA-256: da9e64f89b4b874f6938bf9babe2b731254372ed15d9afc209c5e5335764ddfd