Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a4b22549a1df3a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 22:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c06325345eebb9d043f0f778645f279e SHA-1: 3ec34f189cc33f67f22efd2c339880037b2ded68 SHA-256: 06a4b22549a1df3aaf41cf30165b92b6e504ca85921841e492a2b6f56d2cfbf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://youkuvpn.com/upload/files/79312826966.pdf In PDF document text
    • http://emailreceptionist.net/userfiles/file/fuvipedipumalupanuxonu.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/55194374521.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109110944553700.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/95321677312.pdfIn PDF document text
    • http://vitrine-prof.com/files/59569909172.pdfIn PDF document text
    • http://melabo.com/upload/files/56728509010.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f057aeef79f4d4bf95e97e9c6f1a7332/bunomasopuvolav.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/jadenesokubapuxunewo.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/59924352960.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/84572890004.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/xijipar.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/98366776258.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/37296606487.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/powufajelumin.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/87978946036.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210908155614_a0bl8m.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/belogatina.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-9/20210909075600494531.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134a03e44017---8266632041.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/3866778075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=super+loud+volume+booster+high+sound+boosterPDF 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_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 17492 bytes
SHA-256: 119a4e89b40426072ca6b687dfe172dda1115f99a4336b10b8b44c0642ed1618
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 11056 bytes
SHA-256: 6f990c6d0cffa58050bd877eaafe0a72aa0c4a75d3066d70ab67677d48bcecd0
font_02_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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