Malicious PDF — malware analysis report

Static analysis result for SHA-256 248a7aada1dbc357…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 21:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe94731e78c373831b306183d1930d36 SHA-1: fc87efa008e37471be0d7d3312c1d65d89254443 SHA-256: 248a7aada1dbc35762bd220c9398eb701d6c016d236a49ec8347727a2ed31be6
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, flagging it as a potential phishing or trojan PDF. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wo-kop.pl/userfiles/file/57745933390.pdf In PDF document text
    • http://tiszaladany.hu/upload/file/16578097697.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/86379874438.pdfIn PDF document text
    • http://philipsphotographystudio.com/mowekopidevilopagof.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/rebakexiv.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/86275322333.pdfIn PDF document text
    • https://2winit.com/Files/files/wigilapawagasar.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/90202385613.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/rosebilebox.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210901102254.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/kegevigaxiben.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/86005766127.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/fowatinupi.pdfIn PDF document text
    • http://learningkey.org/userfiles/62579923139.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/vapotivoxilew.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/bovawuwa.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/lojamanetajebolav.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/55862460154.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/rekipobafapof.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c58819fe8f---kugokotitilelotanabavagu.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/xoreg.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/63963172346.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/wesubuzemubujob.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/mukanuxipozepixan.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/4088668624.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/sumema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=harry+potter+novel+in+sinhala+pdfPDF 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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 18488 bytes
SHA-256: 7fce7ef640bc917f8abcb5db8649f1653b9ccd1f515f10bddca787584937a649
font_02_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 10768 bytes
SHA-256: d0b47bcd486cbf69b98fe8ac8ec1b274a98d8d50356bf8ab061d4e0893b89a11

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