Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d53ee92bd1b555…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 09:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa56a35fa7a2f7931965f085a0bd27cd SHA-1: 36f2bea97a4d4578e5612a90790d22da513e78d0 SHA-256: a8d53ee92bd1b5555a47515e0196ddd8906e7319e8437d2fb936c12405ee4287
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous disposable domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://loffoxfitness.mvwebsolution.com/userfiles/files/21701185850.pdf In PDF document text
    • https://hargagila.com/uploads/image/files/xomejo.pdfIn PDF document text
    • http://clingac.com/d/files/80785161964.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/bideta.pdfIn PDF document text
    • http://k1a.ru/images/files/file/69218867947.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/rasalipixaxujidonuxen.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/gisozoxatimarijulo.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901161735.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/29756793489.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/faxigajulezazokeliparufiw.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6370df68401cad1fd9c2778d0359742c/gamulap.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/zavuperanafepura.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d7008c4e2---pelevesepibe.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/zobegokedunupezenusaxi.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/92566900436.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/jusojapozuvuzeti.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/88087895584.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/gefabe.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/gujumavej.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/58573089225.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/vubuxijujupijozof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dungeon+hunter+4+mod+apk+offlinePDF 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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 11048 bytes
SHA-256: 0acae3a682dfb75a6dafe10ce394d5159a23a38dd0a356137ca08e7a19c40882
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 18004 bytes
SHA-256: 72e17da7b0df6bc256e44492180593997bf44d2c6c207cdd0b57b665c99f3c69
font_02_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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