Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84d8697fcabc0a6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 08:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c572c4194c6ce9fe839e8925c63afb78 SHA-1: bebc79924597b9c924fabc932447d49b229297b8 SHA-256: f84d8697fcabc0a6f00af38bac3f8d6d0c4585c46e69066bfeae740277b37bab
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, possibly for SEO manipulation or to serve as a distribution point for other malware. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://yjeverspeed.com/userfiles/file/60782603985.pdf In PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/wufitawapobez.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/risewolabakovaziwa.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/49196697845.pdfIn PDF document text
    • http://vanhacollection.com/images/files/furipekusu.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/14356864218.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/zuvolaxulem.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/67893012113.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451cae14d0f---kedadixonanaposisatogine.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/75326747644.pdfIn PDF document text
    • https://naves.cz/res/file/poliravoforanonukowan.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kabinufivip.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/mesobufokujajasovidiz.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141d942108e6---63712930971.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/96245205204.pdfIn PDF document text
    • http://hocomesun.com/upload/penijugavelewukoketezeg.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc62f88ea5---juwomuroro.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210902_CAE53C001E2678BF.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/7796549516.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/tibilop.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/38464241193.pdfIn PDF document text
    • http://quranday.org/userfiles/file/51986640814.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/rijubut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=minimal+adb+and+fastboot+commands+pdfPDF 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_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 18888 bytes
SHA-256: 81223cedd79b7878ec372a9ade3e2c27e78e04b02f9240bc1b685a3028a82aa1
font_01_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 10684 bytes
SHA-256: 4b290133eef6bafe913245d0b4e58faaeb00a5287ea63d9f61d4a0e6ee512181
font_02_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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