Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6691a2d4c615fd4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 01:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 353dc150240fca34b3f679e2e48d9d33 SHA-1: 02f79e90454ea293b678fc54486f0655e4ca3e84 SHA-256: c6691a2d4c615fd4c237051a31ad11f6b0aa2e928ca1de84eb8e0ccdbfb32f7c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of many unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://gospelpour100voix.com/fichiers/newsletter/file/32983366643.pdf In PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/titekovoke.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/25613153678.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/sazibirunaronosa.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/79479535277.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/pupukepo.pdfIn PDF document text
    • http://www.pvvc.cz/files/xokizaw.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/mexipuvo.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/28533123874.pdfIn PDF document text
    • http://clerus.hu/files/file/resemulebuxalidi.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/libajagukaxeroj.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/jubono.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/73628400574.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/zuzamamikekemeloluseg.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109130105353350.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/64358017917.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613584e7692a2---19726787060.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/91625627864.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48556665631.pdfIn PDF document text
    • http://ledins.lv/cms/file/vukevogusapibemunij.pdfIn PDF document text
    • http://zimmerei-possert.at/46288289008.pdfIn PDF document text
    • http://runhouchem.com/upload/files/86242733244.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210904221129.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/23657533279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=poe+build+tornado+shotPDF 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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 10588 bytes
SHA-256: 3c034063374f55de5b751249b57fd4f95a50d41a1f47348c3857b4e3d2ccc7f6
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 17672 bytes
SHA-256: d12988bf2f5d9a319c1df3ea4fe506dfccc19c0562b477d8625e896e5de72353
font_02_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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