Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc01f5dd1e49e11f…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 05:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00ec9fd8900693c679e4477bbbc9f97e SHA-1: 0e8dcabaca963466f7ecdd7e7da93ae5ccfb0498 SHA-256: dc01f5dd1e49e11fc827e80bcc1317e250922ec401a373eb768881b59271c1f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kildevangen.dk/files/ratenodofowelufufezoxodu.pdf In PDF document text
    • https://rumputhijau.com/contents/files/wunexanuwukigibawidibi.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/55641606925.pdfIn PDF document text
    • http://atomleasing.ru/media/File/55833642988.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/jarowemererepinedise.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/xovotomerifawuwuduzik.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/xuxuwunaw.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/wotunapisaxobozileget.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/nedikobuzuwevowila.pdfIn PDF document text
    • http://recrute.fr/files/files/52043465461.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5e810382dd071e96a84fa900d65fbf4e/54269047751.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/72976194635.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/dofajovuxodoliwifejik.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141d07e49097---lupodalolaxokejalojimev.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/13385863308.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/jibogodegerar.pdfIn PDF document text
    • http://rld-carbon.com/file/35575209877.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/29482817725.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/wisarakamoloduxipozed.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/46754786020.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/midamaxekarudamuzovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+play+io+gamesPDF 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_off0000ac5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5D 16392 bytes
SHA-256: 5456463a1165aa1a54daf0089d9fcb1528d58178f76d81b195c33e465331a22b
font_01_sfnt_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 10484 bytes
SHA-256: 333133227621d67fb56b8948feb67ae6c1c34a586871c4f1afc8752df1369bc7
font_02_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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