Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcec752b8e31ca7a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 05:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a08c1583587d890e9be0fe1557cc9b3d SHA-1: 0aaf864fe1603f8b2ceff87974f20169bab79c05 SHA-256: dcec752b8e31ca7a2215820a306ff25f4fa313abbbf201f90474333a9863f6aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to suspicious domains, suggesting it functions as a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vanchuyenduongsat.vn/upload/files/jugozujisejila.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2ec9407443a3f4c1961bed9f662f1d88/57856228135.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210911064202_vfrlt6.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/54987150396.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/95218923510.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/14217371091.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/64544481518.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/letelugozo.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/sevigesakalevunumaxarasor.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/256719057.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/elia09bcr10un5tk0l6i8aj8bf/jerazapojoxabonoxujim.pdfIn PDF document text
    • https://paperland.bg/uploads/file/62351224085.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/masatoferotifapafix.pdfIn PDF document text
    • http://konberdbio.com/upload/files/tejexofafurupovemel.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/famovumedenosidabexe.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/nikorej.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/48679253874.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/jogexojixalabubo.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/27203903738.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/saletodoxigekuvera.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210902001153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kirik+party+watch+online+freePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/57587727797.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_off0000b219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB219 10692 bytes
SHA-256: 235dc79a807459083dcb59f35f65c6320ccff2671a509a0b644074eacc22ebbb
font_01_sfnt_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 16032 bytes
SHA-256: 29a65a9fd57f41e9103bc0fd0eb211edf4bec850f7ab78e5dbfdf41da52c6749
font_02_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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