Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3661b7e3862797…

MALICIOUS

PDF

72.5 KB Created: 2021-09-14 11:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c49f3d0317e3a2c72be764ea12bae82f SHA-1: 20ec4d778f25af02c22aae51227d54c862fbd325 SHA-256: ea3661b7e38627975d37c5b1e171aae4b11635cc0fb8bb236f1de332aba39afd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

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://terredellamagnagrecia.com/userfiles/files/bowafexaxasivenodimub.pdf In PDF document text
    • http://sgrappresentanze.eu/userfiles/files/tetunanitob.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/palevulefuzezunapef.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/73418998067.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93502831391.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/suxexi.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/tivejok.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bamesezamusikedarita.pdfIn PDF document text
    • https://dptech.vn/uploads/files/sigatexuxapifavumikusode.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135686d92860---dogudoluxobamavezalezof.pdfIn PDF document text
    • http://talleresjpg.es/img/file/mobokuligul.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/rezotewiw.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kavux.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/35915875576.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/xubip.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/15568263979.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/64793184069.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/mezipisejezonowoku.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613461818480c---litaladunovufa.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/8043443962.pdfIn PDF document text
    • http://iwort.de/userfiles/file/kipesakivurelileda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chrome+screen+recorder+for+androidPDF 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_off0000ba5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 10628 bytes
SHA-256: 110af69a309730b40924e8180bc5941da3e4ea28cbaa277da31010db06d6c4d7
font_02_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 16492 bytes
SHA-256: e9dbb0527c9f53bba97d37fce5bc4836a3e7c47e14fbde7ebff47dc09dd9ecc5

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