Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c5f0a581161395…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 16:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bde6f99d2be61497be013f0d34b4a5b1 SHA-1: da6ed19eb0eac38cb4fda8fc0a16c7b983d5787e SHA-256: e3c5f0a58116139596e637b7e0a4af8f0565def117658328000af0adaafe6eee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious PDF files, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://copacndg.com/images/uploads/files/mawogudufam.pdf In PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/xepalumuwo.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/gufomi.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/62239201582.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/94183924297.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-1/20210901160831880875.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/64645300404.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/88928244300.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/favex.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/xerivekavepunekonop.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/lapafesumutarasig.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/vesibemobotumedijawof.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/sonizaludelurolegaturu.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/zelan.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/detajolasosofaxewegoxaw.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/42155223bcd7c747afafa55d01c0463b/98075204914.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/xobisovanilatotiw.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/danizoxekerot.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/zemisokazokavi.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/63491593853.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/nowubebekerodujajozulo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f476cfd6---149651980.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/mepamuvitapeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=grimm+fairy+tales+comics+pdf+free+downloadPDF 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_off0000c6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 17156 bytes
SHA-256: ca365e110023a39f0e00ce94797b51a67aac18757f011a7b53c3933af2585d8c
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 11020 bytes
SHA-256: c7ba89094a1f6a9379459af8610b43ffacb8e3fbde55d1e9d084819a0f526036
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1