Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f37a5e0229c7c91…

MALICIOUS

PDF

87.6 KB Created: 2021-09-16 21:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 44eaf7d3b169aec001aecce0d5af4457 SHA-1: 5541989deac9bdd48fe02ad0f8eea05457eb41f8 SHA-256: 3f37a5e0229c7c91e215bc29d42013500ad426f530bd9bf385459f9481f30990
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=how+to+unlock+mi+phone+without+password PDF link annotation
    • http://metrominicabs.com/survey/userfiles/files/mesujofexevud.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/91040752838.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/27861775098.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/vavodow.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/viporuwovuwem.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/23068944456.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/dozawuxeki.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/giluf.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/ralazizomizavuvixosaj.pdfIn PDF document text
    • http://domainecomps.com/documents/files/modekefokesonatajidarokar.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/66051876974.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/38164025637.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/79902239737.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/38472777819.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/tamazulifeloniruwaz.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/20945363237.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c220e8a2ef---kafafoxekidubajidiwi.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/nuwifubuliz.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/68461595231.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/dobopasedojamadeverik.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/15476970130.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/83239213145.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/zupamujapotajominokowuti.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/40061269162.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/wuxobetilanitejolijatose.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/48f24a3c435bb63715ab5044baa28b3b/24239418476.pdfIn PDF document text
    • 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_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 17316 bytes
SHA-256: b9d2ab439c8ce45049e3922e5656de35ade2472d0c8c4e703d4717d82d0361c3
font_01_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 11048 bytes
SHA-256: ecb49dff2876d3c41331328feda90ee1a1b9d4af02defb38895749d71b1d9d70
font_02_sfnt_off000138b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1