Malicious PDF — malware analysis report

Static analysis result for SHA-256 7087b6941ca23192…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 00:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b03c85a14a5fc8257e97e7fe0aabac79 SHA-1: 02ca0a2fa50fe73bc21946e3210fe75adcc8079f SHA-256: 7087b6941ca231921eeb5bc563036726d9034c17dbfd01a21085bdc3cde83de4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to lead the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://miyagi.chi-kara.net/Upload/files/18097056451.pdf In PDF document text
    • http://kino-cosmik.ru/sadm_files/doxigufob.pdfIn PDF document text
    • http://taociren.com/upload/file/2109191428400290013twngx85uvlf.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210917/210917204316094438lh8nyot91osg.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137741b834d8---83948093077.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161336660a1013---panojetoroladurotoveju.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/3333194670.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/biridovuzenubut.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/8268341935.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/jebafuvesaguvolugataneb.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/70040951032.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/77350042676.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/52237420985.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/rovozifitu.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/4284522326.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/bufumidugupoxegisijila.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210901135927.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/powejijemazolub.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/1042679934.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/8348553092.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210907173422.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/dusomuf.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/74821520394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mayweather+fight+streamPDF 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_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 17728 bytes
SHA-256: 3104f709e2a2886897deabdca702a0d3988bf9cc56af957b9ec9c14d7dd3250b
font_02_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 10584 bytes
SHA-256: 2c172102433e7b15f7d89ee076f98039566227d6803695a6837849fb7825f208