Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e71c96cc4d50311…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 06:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3b5229f21a8a4d5c36690126990ab31d SHA-1: 43d896f752ef4a810d5a26bfee7d26007f863c5d SHA-256: 8e71c96cc4d503119be9fd4a0ff998f773e640f396bdff31d66094ffbed09dc4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm nature suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ntct-dz.com/ckfinder/userfiles/files/96068564293.pdf In PDF document text
    • http://heryeryesil.com/resimlerfiles/98249160629.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/piturena.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/22569505495.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/49573254500.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/87678165139.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/gelomagativipuxadamud.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/98353266738.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210914021558_mne08o.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/masokubevoxi.pdfIn PDF document text
    • http://domosplast.hu/files/file/bovibifanaruvew.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/9850634038.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bfaaf91c---23502044402.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/pokijufirunasopinesigikur.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/visunubakefivuwajexum.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/lazenesajimusonal.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/gulexan.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/mazunarazibijijutim.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109101017459275.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/depunugajive.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/mipaxowawupejubomawip.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/8819712712.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109172224541156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+cribbage+app+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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 10836 bytes
SHA-256: 7aabd2a20bfe4786d483f289c2e340f4bc54cbb1ce8958a1dd14f9c85a0f6bcf
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 17640 bytes
SHA-256: 1711a3143a6294ea9b445726f4aeeff629190fca34b2ec45d4b0401ebe6409cb

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