Malicious PDF — malware analysis report

Static analysis result for SHA-256 db60c0567c3837b8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 17:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39c5cfe9afd671b1957c6f43368df8c7 SHA-1: 95dbd8f872e3b1b0a0fe5a0649a46687625c82ef SHA-256: db60c0567c3837b8a2a24af1ee5cc579ccb06b640a046d63dc7a8813a522403e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://allytemp.ru/uplcv?utm_term=how+to+watch+the+ufc+fight+tonight+for+free+on+firestick PDF link annotation
    • http://nextlab-semi.com/files/fckeditor/file/71800885059.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/48561579306.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/domekipifawudufajatona.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/81201487710.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/ledalexafenilijesupo.pdfIn PDF document text
    • http://brlairport.com/images/file/71548017023.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/mamitibalamezavixal.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/memesizo.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/lexim.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908081714.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/lojufumutaz.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/zonogogugi.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gaxafekopinuromaxigepav.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/92707814556.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/pegaxuvasodole.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ad01754414deaa867494182cc9bcc2ed/42748968306.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/29208328420.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/37932442998.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/88368105290.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/70177334899.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/zitidenoravemobuvemofis.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/88427101137.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142285dd90a5---bemagizodobivi.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/72358826890.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210908_DC2F1C4CBA1C39E5.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/kutesavibeboborafubowomoj.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_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 18864 bytes
SHA-256: f3d2652e8a87e4d3a30b72c947aa89286a4b134f13d4387e911e06a69856a6cc
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 10840 bytes
SHA-256: 05f6773e930a85d43de413eb77e28f5e6d948de07697493c02e88403a9bdaeec