Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3ea1be837e579f…

MALICIOUS

PDF

94.8 KB Created: 2021-09-17 03:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd9d3736466f0a65b35f90af32ccdd18 SHA-1: 7b335ece6579ed3f1b757065851f2c0545649bc3 SHA-256: 6d3ea1be837e579f4bd7ac35473693255a87c2cb6a88221124d94fbe4836ef3c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports the idea that the PDF is used to host many links on potentially disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.srijonihealinghome.com/fckimages/file/22666464651.pdf In PDF document text
    • http://coinproject.com/userfiles/image/file/pewagilesusu.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/4254768999.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/85640733282.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/28184668428.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/99629729451.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614000427ae41---74226837254.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/bebezadel.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/68881223312.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/vozoduzolopop.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/738134395.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/48491029112.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/50349810658.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/230191533.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/33392447828.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/kukisadin.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/22192964763.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d7a081ca---tofajagubarib.pdfIn PDF document text
    • http://el-tall.pl/pics/file/juwubajasamuwekopugevemo.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/6174390084.pdfIn PDF document text
    • https://kaparatt.com/images/File/dusakubadibivatemibos.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-09-10-18-21.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=einstein+the+life+and+times+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_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 17572 bytes
SHA-256: 7a79bae3e7809cfb5e176515a37f6a0aa839292844ce5319290cdb43f8fb23f7
font_01_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 10524 bytes
SHA-256: 5b396919c303f6461a2244f0f0f5ce7feac2a140cfd412b0c4a64ca2d0bda134
font_02_sfnt_off0001558d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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