Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efb91a1dc0d52f1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 14:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0e15417fa3fae13f048fc8412778d8ec SHA-1: 4135a312cfd33484eb9727d37c64b1a6b7cdf046 SHA-256: 2efb91a1dc0d52f19709669e222515620e6702e92023eb3213c1aa66da204ed2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://baigeleather.com/userfiles/file/41747812259.pdf In PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/tazudafifuzonuri.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/2409455515.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/49068663079.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/10358680012.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/wimusunakenezofinal.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210902_6AE1A759E27DF0D3.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/31355489354.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/mukavelowelinatozupeb.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/26378353327.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/l0j7e1ksvrcitjvf2mq9sk9in2/98159127543.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109050451234077.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/31801998403.pdfIn PDF document text
    • http://baoveantam.org/upload/files/61792213063.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/zopijimajad.pdfIn PDF document text
    • http://wohntraumgmbh.at/vugelijatetixade.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0e3dbcbc---72611436528.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/96360608619.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lodofinofon.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/23313602959.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/7582196262.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/18077013629.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/99786801900.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/851137986612e987aefaec.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=omegle+not+showing+stranger+screenPDF 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_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 18272 bytes
SHA-256: 4002d207b4448e7a2afe0c316c624cebd00bee32dd39327e1395308dfbb9c019
font_02_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 10788 bytes
SHA-256: dea439f667f8e8e6ce7c08ae5b0ffa2e61904e4a8f7160ecf41e00433497cbe3

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