Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc38eb6c9399718…

MALICIOUS

PDF

88.3 KB Created: 2021-09-19 09:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7a1a37699e634bc0057e637c4f3af0b SHA-1: df3e783236e92e9b14824027c39a4b7f1b8f99f2 SHA-256: adc38eb6c9399718efdeb23930ab7342aa99f5fd50c9f235cd150e803abd35cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs disguised as a link farm for free movies, a common lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, likely leveraging a client-side exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/94899832843.pdf In PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/jubijida.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210915140832.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/33046634597.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/7454230101.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/37632215105.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/lilimanuwamiwipetimeduw.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/jaruko.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/84840945917.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/47365848501.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9dd1a395---tivom.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/nafelapap.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/verunutenedimalapalun.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/10644685698.pdfIn PDF document text
    • https://trystsalonri.com/images/file/92599134601.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/wafafoboledi.pdfIn PDF document text
    • http://393citizen.com/upload/files/94977212394.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/4982924797.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/513456650203aa6aed972ea9997c7af0/gaxalot.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/xiridapatijimixawewujeriz.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24201541974.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/nagevo.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/tetipiduvivasosedat.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/vuwerigoxogodasaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+hollywood+movies+streaming+sitesPDF 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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 10936 bytes
SHA-256: b4ef6d63dbdd76059e8863f922698761122e4af95f598998f037b48b7ff0c6d5
font_01_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 18048 bytes
SHA-256: 58532f64d16b67160871d5c78d4a237cc6f060849465ef76df0d581894432001