Malicious PDF — malware analysis report

Static analysis result for SHA-256 97730cb7f9cfe86c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-10 19:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d35fede893942aea04334d23af70c963 SHA-1: 0ed45aa457e9d5163e20c6bfaa38ed4ee0fdb706 SHA-256: 97730cb7f9cfe86c36705bbf7119a603d57352c9484ffb5f2763ef11b1b2ee72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts strongly suggest a malicious intent to redirect users. ClamAV detection and ML classification further confirm the malicious nature of the file, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://speculatio.in/ci/userfiles/files/11647054285.pdf In PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/24717866571.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/zepukalisarezuzotogudol.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/91477350745.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/74400350871.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/79548444788.pdfIn PDF document text
    • http://yuli-china.ru/d/files/12204596671.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/zomulovuzewaligigagat.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abe98b2e9---ragiwarupukalikeweg.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/59058158963.pdfIn PDF document text
    • http://teraval.cz/res/file/demoxobowirolazume.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/45479584670.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/11555072724.pdfIn PDF document text
    • http://skncn.com/u/files/7001800786.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/pedugefij.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/70827885586.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/29371957463.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/77120367308.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/16844262769.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/pikajugogituku.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/xirutibajunali.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/77612022494.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360d806c21f---wosodefajorolopejifije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=qq+lite+apkPDF 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_off0000bac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC9 10048 bytes
SHA-256: fc1ff381d6d3bc8c4c02997ca2a4b9f3507ad59b1d473fa8b41e217153a37bbd
font_01_sfnt_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 21468 bytes
SHA-256: e4410efa6dfc882b82fba1c5c415bc77ad0f8793eedb25df9a9d203978e4b1ea

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