Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b37e344439cf3f0…

MALICIOUS

PDF

75.7 KB Created: 2021-09-14 05:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da0c15d0982b0b6540d111f4ab603cbc SHA-1: 2c1ac5064bbdfeafbb4456e2d7a46aa96c3a9c86 SHA-256: 0b37e344439cf3f086a2a1d11f91e3637f3571489dd8b0fa8f801d34f35a6f77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that lead to a link farm, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://willes-gb.com/uploads/files/202109122337053639.pdf In PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/renadewogopegusex.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/40694486432.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/35691418923.pdfIn PDF document text
    • http://pi-consulting.ch/download/53724465010.pdfIn PDF document text
    • http://zae.me/datafiles/file/vosar.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914095204646.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/zutijazeboxabi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41a5bee33---27324621820.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/danexoborumoz.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/24600697584.pdfIn PDF document text
    • https://computerzone.pk/file/75209974414.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/32042507322.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/44827754692.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/bebodogobam.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/rizovituzivepopuwimeg.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/kovebidedom.pdfIn PDF document text
    • http://synergyproperty.com/images/files/25003132790.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/xerikusonimosawiwugoj.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/92728068971.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/xuvitaduzotanudorosuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=convert+pdf+to+excel+altoPDF 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_off0000c3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B7 17724 bytes
SHA-256: 7b6b42aaf3e16913e849532e18b75d5392d640ee0081c36f811e142a3aa36411
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10552 bytes
SHA-256: e9c223598df66a9f29cada7b58c6e52efa1c3a7445532f46b45fc57a7c4644ca
font_02_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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