Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5fe74c4a95e0c7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 12:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4048f2f243e30dd3c122f56e1826bd60 SHA-1: 0bd9650ae01d73828c95c53c424328798cdf378b SHA-256: 6c5fe74c4a95e0c7b3bae1a0f19f2e0b88e112d6f7615eba9444314a22bb9b2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a network of low-quality links. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=plants+vs+zombies+battle+for+neighborville+apk+download+free PDF link annotation
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/7457584568.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/60918185825.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/gutag.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/xabusezowoxegan.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/vulemimudakuxefitibewivu.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/gumanesarirerigurute.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/dijowewoxewexatokunalevof.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/8081834844.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/somulefuj.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/50198011197.pdfIn PDF document text
    • https://mlspoland.co/files/file/finax.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/24741017033.pdfIn PDF document text
    • http://grotech.in/userfiles/file/jafujinagozawebufoxi.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/gipavewagadizubiv.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/15139873435.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/13304023005.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/larajolorosazajusetow.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/67274494646.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/suredugod.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7fd8fe69---rijiras.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/55329128227.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/82614403228.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/23671093015.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/25245042924.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_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 18016 bytes
SHA-256: 903fa85afe6e94709f3a236aa2e582b71b43ab1c7028ad62d2bf4bb1b16c19b8
font_02_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 11388 bytes
SHA-256: 88f905f30fd7311507925d4ce88c3abd96ef48940492ba3e0a244ce807b6ec25

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