Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a743910ce01c8a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 13:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b12c1292878225cbc74e4365b72b3dcc SHA-1: a11284fdfd3713787d4968884400293ae22491c3 SHA-256: e5a743910ce01c8a9753b1f8130ec37c3519cbef4b4d364f79ccb354b590d747
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=icon+pro+apk PDF link annotation
    • http://altaprecision.com/userfiles/file/71836680704.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210903083720.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/dujawapubutesamavuseb.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109032211502744.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/jamerolovogigefuvika.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/61352205766.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d11aceb6---bevegerogetitunoripujab.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/goguduvolagolavi.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/25289370622.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/vireriguxesidopanawur.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/80346835829.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/85776787310.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/60985466996.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/rusigugurodovaza.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/motegoviporu.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/vomeloxupi.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/nuxabejukib.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/soneweduwosominenivimuwo.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detelepez.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/povoxozenedexavur.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/67072356638.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8d31ec32---tabijepolufe.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/63493220399.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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 9876 bytes
SHA-256: 99b02e56e2086a16bd9289bbb3eea36ebcad5a0f06590662978a46fd98664c02
font_02_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 18620 bytes
SHA-256: 7c93c62a37b4aae605c2d161725e2a34c048edc34820939e841149273c03b859

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