Malicious PDF — malware analysis report

Static analysis result for SHA-256 26da50cd800d7aba…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 22:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b38aefc2ea2a13502bbc15958f7b0e8 SHA-1: 5f2c11ed61357d2ae69707a4b9f3e4c582007e6f SHA-256: 26da50cd800d7aba48622b7554aeb1ae3ee065d0abf208198245032c8df2aa03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on domains commonly associated with malicious activity and link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://satyavnetworks.com/fck_upload_images/file/81567261645.pdf In PDF document text
    • http://suvagcentr.ru/userfiles/files/83953879729.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/39600649821.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/45051475110.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/tojekuvelime.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/sujijawejiwi.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/gumiminepedaruvaxoko.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/jijivonajikisi.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/20017078959.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/82440642695.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/fenel.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/29220069094.pdfIn PDF document text
    • https://motecx.com/images/file/gigijevidedox.pdfIn PDF document text
    • http://paliukenas.lt/i/File/wulinowosanugunipezirasig.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c3b92840a93166cc2fb966d722547f6c/botimixizusaxogiti.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/fibomofi.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/37797351568.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vumatekawabexo.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/78716122996.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/60571060716.pdfIn PDF document text
    • http://tabletopad.com/images/file/dokuji.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/webibejoralumure.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_AD84BE586D66007C.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905a97d3ed---kajolemukifadonuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=watch+free+tv+shows+online+freePDF 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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 10576 bytes
SHA-256: bcc9201375979ba78b6c1a29336b53c8335e8e9b6b48f3cf1a3790c56af232a1
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 18372 bytes
SHA-256: baf196aa52750cab5dd30c684b03a91fd05f10580d0fac7a1909bad40b2e4fc8

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