Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1eb6a1d87ef6780…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 08:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 771cfe59d8a1bf51d76ee168f511aa0e SHA-1: 5be1641d009f9739ee713c34e4b4594f36f37d1b SHA-256: c1eb6a1d87ef6780cef6f57deb8551e97ed199db717d2ec47b2327eb2e44f53d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating a tactic to obscure the true destination or distribute malware.

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 http://xn--elementy-zczne-kwb98g.pl/media/file/7538449676.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8ca7a0a5---mudevonagunikuvatesinod.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/74082053074.pdfIn PDF document text
    • https://thietbigas.net/media/files/mozomidexoxexurina.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/womunorita.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/12191015897.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/76871388133.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/19051625734.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/zunubikijesukep.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/melizinasusener.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/zoberejegewezowifutan.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/sefenepusedowedemu.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/41260100887.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/bisipameburulolox.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/64768664305.pdfIn PDF document text
    • http://1carl.com/userfiles/file/fexajezipetusotizetuzij.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/20304525861.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/sigarij.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/79650818735.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/83178903228.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/xoxijejoxuwa.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/80352229073.pdfIn PDF document text
    • https://ms01bet.com/contents/files/11209720798.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/batenuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=3d+video+converter+for+android+free+downloadPDF 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_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 10528 bytes
SHA-256: b99af2183597c2f3f7c86ab61111933599ad6b8f3d2f9be90976a8e0ea5a826d
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 17184 bytes
SHA-256: 146ed6bfbdf3900ac3e53270e46e0adb3c4954771d5f91baf2abf944ce0a8d8f

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