Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bcade4c06599bb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 12:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 605981dc6e7c91334f325f4b4ede4796 SHA-1: cb73a12c134fd5891a2a019be5830ad538276382 SHA-256: b1bcade4c06599bb10e78873d7fcd7a94377901866ac44e18c0b46bfff53da6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a phishing or content-luring scheme. The PDF structure and embedded URLs align with techniques used to distribute malware or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=an+introduction+to+parallel+algorithms PDF link annotation
    • https://sheenabusesandcoaches.com/userfiles/file/gegifagavumorafokufokere.pdfIn PDF document text
    • https://tavio.ru/files/file/71744259601.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/xodagajoredelafodoluzu.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/zitikabesewosukaruzesele.pdfIn PDF document text
    • https://oferta.lt/i/File/12616749747.pdfIn PDF document text
    • http://skupka54.ru/upload/m/bodevunatipijex.pdfIn PDF document text
    • https://invision.buzyhub.com/files/26459450037.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/78424589704.pdfIn PDF document text
    • http://eichler-kammerer.de/teletanuwugirinitiwe.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0b848841---52921228352.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/wuribulikoxakegodogura.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d5d60159f4e429ddca07856f20a55f4d/tolufalitevoboxokamipaxa.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/79512169860.pdfIn PDF document text
    • http://sparkpro.lv/content/file/sujukix.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/todisulunolelix.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/20660366577.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/73098963649.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/mitemowixasuvuwawib.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/62573829839.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/wufoti.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/vusejevepujegavufevokuga.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/33010826368.pdfIn PDF document text
    • http://tochuchoinghi.org/files/20817424215.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/53371496937.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/17563594146.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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 17012 bytes
SHA-256: 8c8dabff0a53fef9186e697c4152abe04dd2acd4d3bfe215cb63bfbfa815d509
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 11040 bytes
SHA-256: 3d9e34905d7de7b1bd49da631d8f86c6235db1b92520e8549fcb3404e39e6cd1

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