Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad5b7a6a40c0f9d…

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 03:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 466cc5541402fb9abbdb9f1e949bc909 SHA-1: d9f709731761e57be0cb8f0c7aa102ee6a714f7f SHA-256: 8ad5b7a6a40c0f9dee2250267271b59087bbc16f549a9119259cf5c8ebcd0df4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external URLs. The PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious sites for phishing or further payload delivery. No scripts were extracted, but the overall behavior points to a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c51377f168---pogofafekivikikelisikafug.pdf In PDF document text
    • http://sudeoksa.org/userfiles/file/20210919230224.pdfIn PDF document text
    • http://orderkai.com/uploads/files/46519729975.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d6aa271f5---76905847855.pdfIn PDF document text
    • https://apapunada.com/contents/files/jonofuginalujutitazarired.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/nexedix.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/zarurumimizeput.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gosuzer.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/paxulerodeju.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/29719247962.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/65756398549.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/86904862707.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/fojaxe.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/pilajo.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/vuxitagowopabapoxiji.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/zakewo.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040902277714.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210929070333.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/xagitinafabazaxek.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-10-2/20211002192941856775.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/65735385474.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/wuxopenepegivaxekaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=physics+periodic+tablePDF 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_off0000b135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 16548 bytes
SHA-256: 9230a77f31c3bc5e95dcb8b7b93c761f1de558756bbe4712cca35f318f915da7
font_02_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 10760 bytes
SHA-256: 873054f7f8aa4f996af5e003409599895ad1d04c818930189eb08bffeb8a70eb

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