Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcab03c903499b84…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 22:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58fc948628db620cf1fb64b549e5a446 SHA-1: b54a00f10f5c815d2db782a0ea96561deb525c2c SHA-256: dcab03c903499b84423edd9e919be4740ea6fc0764537cf9300f6409a708a9e0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external domains, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiosantese.eu/userfiles/files/wevuzafoxobazesux.pdf In PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/27486813535.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/35210144846.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/sogufoligulididawowo.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/zekopefakosimulule.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/26337649518.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/lowuwagixiwo.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/fipominisad.pdfIn PDF document text
    • http://hidropro.hu/upload/ruwefixem.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/55771198623.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/relowoxol.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136103ec1eed---pakugebagigimon.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/26270331659.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/20413493244.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109030410079361.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/8533155974.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/nefutonujivilanotologe.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/9416272473.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/niwulesuviravorenobaliwa.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/12491004636.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/27544245902.pdfIn PDF document text
    • http://yilip.net/userData/board/file/15186712902.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/70547661722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=apps+like+geoshred+for+androidPDF 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_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 10752 bytes
SHA-256: a658d52ee2d90bec254e09dd718002f893439b7983de5aaba723d43bf9e639f8
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 17180 bytes
SHA-256: 5e3eb3f3c338df8f30780308c9f7d85b13a8d2d3c3f5abda040bc6b5afd194f7