Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c4a7364b64ff0b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 14:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb1f61c3acca8e849f69094859f5fc39 SHA-1: 746ac1f32a3f36f85347b28cdada07a04900f158 SHA-256: c2c4a7364b64ff0b1a80734f128826260ed9920073c583e91c7a66a1f7f5c07c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it functions as a link farm or a downloader for further malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies it as a link farm on disposable hosting, reinforcing its role in directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=duplex+play+iptv+apk PDF link annotation
    • http://aylabawadi.ae/userfiles/file/46235684355.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56318759180.pdfIn PDF document text
    • http://tcihk.com/userfiles/14987433420.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/melilodidatigobemilobizo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/em628unl48q9ldbrkk6nfb3mkd/tijakisewugike.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/55762148459.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/74294011851.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/xaxapuxijifeduga.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/82229447532.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vinepikikador.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/92613221085.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/xuberopinuxumilog.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/3068573962.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/83818337958.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/25970489895.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/damipemofedajogerap.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/5517087887.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/80036975469.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/sajonidozepifavotuba.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/25234378089.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/48879305433.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/6252750704.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/goxirofezugivebitekomanu.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/71219223718.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/zezogijogupoxumijado.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614322699bc83---3248540508.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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 20312 bytes
SHA-256: dce1356da5bb552542d30734c2b8ed8380416aa4407ca4a9b9c423e80550eda2
font_02_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 10228 bytes
SHA-256: f85c173e162934923deac418c1e5716f580893a0676ac8e9f2394b64580b9cbb