Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0477b6223b82f92…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 04:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 177a83dd9ec9617a89b5a95a9ff5c85e SHA-1: ed4ff98648cd251812a1e301eb0d101863a7d053 SHA-256: f0477b6223b82f92abdb49b024a3ec4e7c1286d8d3b906808e84d207a078ef33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no executable scripts were extracted, the presence of numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggests an intent to redirect users to external resources. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a tactic of creating a large number of links on various domains, often used for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sukhonthip.com/file_media/file_image/file/85379171628.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebbfc8bc22---mukije.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/zikaxokusuwudaxun.pdfIn PDF document text
    • http://th-hl.com///upload/files/56823816013.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/toxobomifole.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/zowakoramu.pdfIn PDF document text
    • http://sdes.in/uploads/16588871582.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/davovil.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/ganawefajatan.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/14958777210.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/guzosavabubejunevafavizaw.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0ce424f110358d1b05fbfbb17ea2351a/lukewanoge.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/48291481940.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/rabilesilikamefajenaxag.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/84731438229.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/lofonodasitebuj.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/zawopuxuz.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/78227836766.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/69755185123.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/vimoto.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/20542810525.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/66413768600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=atomic+radius+for+boronPDF 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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 16824 bytes
SHA-256: 8b6984e72615d4b3099eec32334fa0b9a078994dda74d2b672fc53fbdb3db6bc
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 10680 bytes
SHA-256: 5b6198d593ef6734190721d7bf6817428092fa58d7113d1560411bd8ae1180dc

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