Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3d0f23c99d33c8…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 15:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7de9f1a88c8478141bd2e276ad2035fb SHA-1: eec20dd919d4c6384b0c43f630f8b00e2f1c0ae8 SHA-256: cc3d0f23c99d33c8e10945658da61cf45877dc16635c0bbff15e14d5b0e5dcbe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is structured as a link farm on disposable hosting, with numerous distinct hosts and UTM parameters, strongly suggesting a phishing or redirection attempt. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://9262895.ru/ckfinder/userfiles/files/74005093614.pdf In PDF document text
    • https://tedesco.pl/userfiles/file/16746163401.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/lolefumonulajikurivef.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/7333914514.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/vavegixuzepinufesevu.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/ramorikikogesuxinebibur.pdfIn PDF document text
    • http://vecsecity.info/editor_up/dumofutijikumobadimuz.pdfIn PDF document text
    • https://cardolf.ro/files/45624620393.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/nirumoregi.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/2266093161.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/nepajofumez.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/cvf0848i7bpgjtf08hcgph179g/45214930921.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/94516067698.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f501cdc16946b68e05166b8ae7a42ff7/nemokipotomobebipovila.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/34937456407.pdfIn PDF document text
    • http://wohntraumgmbh.at/sijit.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/62214290355.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/52743287266.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/liwoxuk.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/94077432748.pdfIn PDF document text
    • http://samtekelektrik.com/files/89868187606.pdfIn PDF document text
    • http://bamor.org/userfiles/file/samepidofuzab.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/nixusubutodu.pdfIn PDF document text
    • http://irths.com/upload_files/files/xemikige.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/sagubelagusisobawepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=toca+world+life+modPDF 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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 10316 bytes
SHA-256: 8afc5a751ae7b636ee3fa64cd8767dcfab79712c74eb83cbee2567fa8b6c5232
font_01_sfnt_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 17420 bytes
SHA-256: c534e92053e658a63904ef3cfe8b618abc2456eed104fd44445ce3d2631cc834
font_02_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1