Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dc173c37c46ae9…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 21:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 34959aa291ceb87163df24d95a53d181 SHA-1: c93033a41aa81751a6fc92a5e5a1fa867a174997 SHA-256: 27dc173c37c46ae9d991dbefb82e90607d10c3a10df1133e04b134a57a4438ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://rainhouse.kr/data/editor/file/3576471286130f5bb42f13.pdf In PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/tukemubezoxupisaleta.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/35025127.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090206125470554.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/60350887892.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/18333928065.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2ed2ecbb265cd8caf0f47f41d47ca3c8/88413710775.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/jerak.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613966a0eb774---tutisefonew.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/wedodanavid.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/80802215049.pdfIn PDF document text
    • http://zamgph.com/uploads/file/092046523254.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/20729083061.pdfIn PDF document text
    • http://recrute.fr/files/files/vabaxugilesowa.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/85760750733.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/nepetezazufan.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/lotelabaledagirukox.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/kawutubimosanokuki.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/82701120195.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/toxosogebusapikejawi.pdfIn PDF document text
    • http://baove24h.org/upload/files/93810620353.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/segaxaxizeram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hp+yang+menggunakan+chipset+snapdragon+730gPDF 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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 17548 bytes
SHA-256: e763b832c5e1e15cb6099851223df9dc981bd755f958b07e89818304f04afec5
font_01_sfnt_off00011692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11692 11556 bytes
SHA-256: 0b883e20427bdffa856b76999f27c620fbbf778069e774376b152be1d452f144
font_02_sfnt_off000131a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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