Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bcd5cfb89f3d18…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 20:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a5db3649017fd59585725ba8ff31a1b SHA-1: cb69dc4a573c290d3173ddfde438c8a0de776364 SHA-256: 42bcd5cfb89f3d18d9a9caba07f4535e9cfdcd2ce3139f83a13f309bc03ee4e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=el+alienista+machado+de+assis+pdf PDF link annotation
    • https://0a3exp.com/upfiles/editor/files/bejewuvogu.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/vexesewegawonoke.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zumepaxejifizagixokixobo.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zagevagusikeru.pdfIn PDF document text
    • https://andana.us/files/files/9856602664.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/bolibedofi.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/10/xugapuladalagemuzurujagod.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/sovobagatufa.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/faxuzojadolunisoduvufama.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d9437855---60752267597.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/23591942104.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/39558597195.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/92735520540.pdfIn PDF document text
    • http://nanopena.cz/upload/file/29151644997.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/33692749804.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/zadijagiserotevod.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/98469003184.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/68118150550.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631060911.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/20443660044.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/barasida.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/57043011191.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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 10768 bytes
SHA-256: 37891594253b7b18cd8c81d2881a5bc6d8c81989c4159cb1d04f2de349510b28
font_01_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 20172 bytes
SHA-256: 9a87123dffbb90467755bf38096f111f3f470bce9785316548b211d0dadf6712

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