Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e86d6d8f2d181f6…

MALICIOUS

PDF

90.9 KB Created: 2021-10-06 07:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8504f151de3669726d23d5c19f454d3d SHA-1: bfbad081dc4dc6dab21bd33d29a3fb8012c846fa SHA-256: 4e86d6d8f2d181f603c8661d9a1d2ba38223f81f9b6bd2974f8541a094880a89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by multiple heuristics, including ML and ClamAV, as a malicious PDF. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://fantacyhandicraft.com/userfiles/file/72827916050.pdf In PDF document text
    • https://bloomeng.com/uploads/14186574420.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jozutovuwukedivolegiduju.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b780335ab---demezalu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20211061244104358.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/vixafovuvek.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/gevojajojamumekuluwivum.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/lekoratimuwubatulibuduxe.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/sepef.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109010601186592.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/7609103175.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/22779306098.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/fusemipisiwa.pdfIn PDF document text
    • https://cecprint.com/images/file/kefuwonejemi.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/65367434150.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/fezelefuzujer.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/33920543805.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/zudutinakitogadu.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/64679149989.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/texoras.pdfIn PDF document text
    • http://kocovnici.cz/userimage/file/56256624669.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109031005274495.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/44211495688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=open+space+synonymPDF 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_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 20344 bytes
SHA-256: 81f0da1c237077151a0acacc43652d5cc11f98b068ad355f1a5ef074c8fa0396
font_02_sfnt_off000146ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AC 10340 bytes
SHA-256: 6771b1ed9d7c92ed7f5eac97b9795bd2ef9948208404002d22efc9e5bacc0ca0

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