Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f12cfd2b959c592…

MALICIOUS

PDF

75.6 KB Created: 2021-09-30 12:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e11d405e38d514c4db410f534f9c824f SHA-1: da55f91595d9490f542b4c1ab81a52ee68df6687 SHA-256: 2f12cfd2b959c59237817cf8cb5509b2db5697b19d160f9d8eeb4c9d9fe8b4db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The presence of external URI heuristics and the sheer volume of URLs suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://drafthe.ru/uplcv?utm_term=como+descargar+videos+de+youtube+apk PDF link annotation
    • https://lordoptika.hu/files/files/jezuvido.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/fidono.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/risok.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/52921994230.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/mikukoke.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/sepadikexepow.pdfIn PDF document text
    • http://skisun.it/userfiles/files/21266450481.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/jibojozenepiwupevaboso.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gojipawu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa2933d95a---86921550060.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/39563180658.pdfIn PDF document text
    • http://vhshf.de/File/gajumuwiv.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/fozubipipazojudolatip.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/towerarulurul.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/tofejegozazu.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/zamasama.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/bevax.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/vujatebakijoduvo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/38097849981.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rc34etmdkg29cmsgd2dj6jvc23/40136812504.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wevokewulajokan.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/84218047394.pdfIn PDF document text
    • http://chpcentre.com/files/file/8371714374.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/sibateroke.pdfIn PDF document text
    • https://indian-sped.szabgab.hu/fck_uploads/pdf/57753102516.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_off0000be96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE96 11252 bytes
SHA-256: df00903b9a46a50c2f2c9c464ffb0117656b170798721d5c3fb142dc20592fef
font_01_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 18196 bytes
SHA-256: 7d1c211aa9c608f0a06504e384fab0a51724b62c71d5794eb572497eda076711
font_02_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1