Malicious PDF — malware analysis report

Static analysis result for SHA-256 2781902fa0cfde48…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 04:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7fd57484d3301b0f5d0de6b3dddf7283 SHA-1: 8a4c897d0dba7845b663beb9e4dc3064b8efe256 SHA-256: 2781902fa0cfde489b2bc9d999ae0203e1bc74f0542efc9cda0a5a60d9c47b7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains numerous embedded URLs pointing to external sites, many of which are structured as link farms, suggesting an attempt to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/14728102899.pdf In PDF document text
    • http://sfipl.in/userfiles/file/34958637355.pdfIn PDF document text
    • http://techbis.pl/files/file/55092834555.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/semofagaxadekepagikugeko.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/datamagudewawuzaz.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/temuzigisimofolapi.pdfIn PDF document text
    • http://sartor.ru/upload/files/75664064192.pdfIn PDF document text
    • http://levotst.com/uploads/files/ropisilil.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/20967216150.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/ragofexesavum.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/51523149612.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/27734583338.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/nozal.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/xelamadafomutugidexesas.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/69246056768.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/kikexilowopibijuxuxipoma.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/femuseva.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/nufagusosamitupakefeni.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090410581016.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210906041235124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+remove+unremovable+apps+on+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 18532 bytes
SHA-256: 57bfddd8f547e26acbdee74beac4f7b9400a44f4d555036edf264f47b2c9fddf
font_01_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 10936 bytes
SHA-256: a17e33e9ad59fba2ecf05e09783d7a3b823fbe5a4b339ba8e7b8a24d9f10aee8

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