Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d542ad0bb8e54bc…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 00:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffb4bc65610ac0a4c7b3ae4f417772de SHA-1: f089fa0fff7891d9b5be22990838ac935819cc00 SHA-256: 1d542ad0bb8e54bc7cdb0abb066d33c2b3cbd497c3a02900329bfe5a2f41b74c
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 exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to external PDF files, suggesting a multi-stage attack or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination or purpose by using many distinct, potentially disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://abwfinlay.com/uploads/files/nemubonitarifadimiwobew.pdf In PDF document text
    • https://fallahi-sch.com/userfiles/file/24827889675.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/zegel.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/jimejotimajogaze.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/47229657445.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/lejiv.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/3685880700.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/89728346948.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/23245200330.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109062203536178.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9938b0c5e---27070145293.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/74064859023.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/97065659898.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/90570525073.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/bifuvalada.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/99741892281.pdfIn PDF document text
    • http://wirheiraten.de/images/file/86474461819.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/pazod.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/85292679543.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/36072264778.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/gelidukisisopor.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/binonekivevula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=virtual+families+2+modPDF 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_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 10600 bytes
SHA-256: 6780d1359af8282204ba6bf079489fa26eb4812e8c892ebafd2d66cb6eb85ad6
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16800 bytes
SHA-256: 89dcbf32bafe3f988bc874dcebe7d8eb3d28c90f365bc236760a7bba72758568
font_02_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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