Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6a2ad6e6da2f4a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 01:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61b1b4fa8919a349841ea01ca8900722 SHA-1: 28fd99342525ab747ef32535f902b88d7c5fa0f2 SHA-256: 5c6a2ad6e6da2f4a3ab82c8d1d6704842cfc5e32786652387c9a96ffddc1df66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://kiofruits.com/admin/uploads/files/43907712801.pdf In PDF document text
    • http://biomehl.com/images/content/files/vafiruzoriwowaligusina.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/jelukojudomu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/69702069019.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/73922202256.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/98758926052.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/tetuweleg.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/resemarunagavufizipageki.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/3635454486.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/norigikikasovuperej.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/zitoliludejonixat.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/puwisetiwetufutavum.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/93837323504.pdfIn PDF document text
    • https://goodline.by/userfiles/file/zisibe.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/3038381803.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/11856987488.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/begelafejidoneju.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/75073008293.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/zadiwuxariluxekofexavix.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee6696209---mubomibibutunazisiwerolo.pdfIn PDF document text
    • https://cmoretv.com/userfiles/98265416223.pdfIn PDF document text
    • https://aneri12.cz/res/file/lobolifuwodu.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/domewutipirovapida.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/6831960013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=flutter+doctor+android+sdk+file+not+foundPDF 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_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 17960 bytes
SHA-256: 28626634a5c8c30d7554f97c8c32afe68bbf87515137c39891dc96371c66c392
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 10636 bytes
SHA-256: 438753c3f025dfc2e3c1d12e92cbacf0cdb7d17121ae9538bde1d8313c924ca6
font_02_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1