Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a54dede84709d6c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-15 05:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 625d4ca155b9fb17f823bfa46e2f638c SHA-1: 315874e09836e4987f77b17ce885cf99b40aefd3 SHA-256: 8a54dede84709d6c7c5eaac780acc3dc3fb5f9f11faf3c26fc3691467f4bbfb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to suspicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the PDF format itself can contain JavaScript, and the presence of multiple external URIs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=karnan+movie+watch+online PDF link annotation
    • https://beytarimcilik.com/admin/editor_resim/file/zilokimolikoxibiwofug.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/36970331813.pdfIn PDF document text
    • https://emenu.hu/editor_up/89709229852.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/16717065444.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161391119c1d49---rigoteketokodut.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/9832445482.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/6207461142.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/56651049470.pdfIn PDF document text
    • http://pb-book.com/user_file/file/balatu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/0b0b75d3bb9850eec7ad02de1fc6c5bb/kagelalumopez.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/sipekamotuwoti.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/biguwekapajodanizej.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/bepukevevitid.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/radisog.pdfIn PDF document text
    • http://chongros.com/userData/board/file/ditizexagilasipo.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/tisozagimabod.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/debobikoresuwidadapejixa.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/3459991561.pdfIn PDF document text
    • http://dobermanncz.eu/files/lodotemusilanuzemaxogeg.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16306832932Sw6.pdfIn PDF document text
    • http://newworldss.com/uploads/file/22309747163.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/92806936170.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/6051868772.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/99804321156.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210911045541.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/32608744119.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_off0000b49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49F 16756 bytes
SHA-256: de51814b4fff4c0acfdd7e28418224a0d75e5d2c346bc4a56c026d6eba096f8e
font_01_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 10472 bytes
SHA-256: d6f8a28971cfa8780c121aea08099daf8e66a54e2f19b9b76e0ab6708d542e9c