Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f78d052ce50d407…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 13:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b81ef0b01c5d3ca3d6babcc45d73d37 SHA-1: 957091bc105ff6597c636600ee9727ae6dd10cb2 SHA-256: 4f78d052ce50d407778a12618ece5e6c3b4a3fab9fdb7d346faddb46d8f3d9cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=bring+it+on+in+it+to+win+it+gomovies PDF link annotation
    • http://thomas-zigon.de/images/file/wifodefos.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/xizorekelekew.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/65732841838.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/valomonevaluvuxato.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/gilobuxewoxazufebidojiz.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/bupezu.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/dovujimijafirivunikuban.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417ce65a39---35876100154.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/23193990703.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/77283417936.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/59195383114.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/vevuwakobofuw.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/11119615575.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/43609579381.pdfIn PDF document text
    • http://strandedtattoo.info/file/fogikediminonapinijer.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/21693267472.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/godutuwokitokovubabip.pdfIn PDF document text
    • https://plasy.com/uploads/file/rudobokowimo.pdfIn PDF document text
    • http://househouse.it/userfiles/files/83269477759.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/kitarewiwugujurotidaxip.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/73542341368.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/fovujef.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/4226552373.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/6695124757.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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 10448 bytes
SHA-256: aa25c79e8e264fb8904b05b41fb13835bf01511af11bb83c67e4cf81abf67cf1
font_01_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 18308 bytes
SHA-256: bb2ceb512eea4053afad9d51e46389c4ddd2402e2aaf252c75158d470c8403c4
font_02_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.