Malicious PDF — malware analysis report

Static analysis result for SHA-256 4537562b4c87d9e1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 11:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fda4fb50b6acb205a99029f837de97ff SHA-1: 8ec9dbe5ec98729b4b7f5bf99263187dff3871fd SHA-256: 4537562b4c87d9e13a9f0d0e5af387f5ed5e18b01a5df374c89da94d7d328281
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. The PDF contains numerous external URLs, many of which are hosted on suspicious domains and appear to be part of a link farm, suggesting a phishing lure or a method to distribute further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://monyetjoget.com/contents/files/33519460522.pdf In PDF document text
    • https://highlander-inn.com/assets/userfiles/files/24035478630.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/87049832292.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/53387921254.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/15992811108.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/93267610654.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/zurowodupomuk.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/95636028439.pdfIn PDF document text
    • http://iviltra.lt/images/files/tovisefuxuduvisazegew.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/28365056775.pdfIn PDF document text
    • https://isosklo.cz/uploads/pavufinixomodujim.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vikuliwe.pdfIn PDF document text
    • http://artio.pl/files/files/wokorifula.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/dusedixesami.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/wobakotezakiw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gakudeme.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/35669455491.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/84476059952.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wikujorofijuwozapinaveli.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/mupomu.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/tisedanipufukefowawofum.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/34351066275.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/luvosigumusivus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=miglior+smartphone+android+2015PDF 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_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 17408 bytes
SHA-256: 69ee3755cda573a601074746c2b109a3667a447d52b3480ecf186f5cb00d475c
font_02_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 11260 bytes
SHA-256: 4ffc7566c38eaa0f46f664776061634826b6eccbbd05d7bdf026f660378a9e90

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