Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ffc65dfa55326b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 00:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dca12abe5babe22b8e82116693b79d7 SHA-1: e9cc2a7c3db17e83a9953cb917c77c500ff0ea25 SHA-256: c9ffc65dfa55326b42620ae69bbc320f8752d8c299f1ff5167bc6b11337ad11d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, a common tactic for distributing malware or conducting phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=biggest+arab+country+in+area PDF link annotation
    • http://controldellaves.com/app/webroot/arxius/file/12061275643.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/23400185860.pdfIn PDF document text
    • http://veitali.com/upload/files/86823802570.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vovitemudinomujak.pdfIn PDF document text
    • https://cubic.is/userfiles/file/33748457048.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kofonozalanuxolitukiz.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wuxuxuseritezotako.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/98061898359.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/25418592692.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/mebikuk.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109111101155478.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/21212961020.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/905974570.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/gezinesopafebajupunipin.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/munuduvajuvekunut.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/47603654614.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/78773576514.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/87ejm0bipavj841neb0bfoq1ag/12484221102.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/67228513949.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16313111522826.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/soxoduvudujidusalidagij.pdfIn PDF document text
    • http://thaide.org/userfiles/file/25054143350.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/20862348692.pdfIn PDF document text
    • http://theponghop.com/upload/files/71066808384.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/taxilugapikibuvukibuni.pdfIn PDF document text
    • 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_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 10768 bytes
SHA-256: c3faa20906e310144f2ab5d502a839e95d30fec311b9b39f2eee16aec09cdf61
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 16748 bytes
SHA-256: d56a303e6b5b5dd617fed121d163447abc2066bc91b5e207d014317632f7f5b2

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