Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d78a5b7934a63e5…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 19:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 926598c5ac9373b6d347dbb466f3501a SHA-1: 863ec7ecdcf2e905c6fa89950b86c4ea5a2dd659 SHA-256: 6d78a5b7934a63e56ba7b6f26a39f684134e43b0e5fd591452b153ae314a10fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cristalparkhotel.com.ve/ckfinder/userfiles/files/1546770482.pdf In PDF document text
    • http://kasargod.net/uploads/file/naved.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/53778537762.pdfIn PDF document text
    • http://talleresjpg.es/img/file/fojolaxewex.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/vuvizekolotugokusobuban.pdfIn PDF document text
    • https://limsurdua.com/contents/files/denilotagupis.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/kokekizejamo.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/49431615827.pdfIn PDF document text
    • https://rajaunited.com/contents/files/loseluziwebukided.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/jenasukuk.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/38987596604.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/35070489620.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5246d529b3a1ee5e1e473390bd96a3dc/42888281767.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/30479542821.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/39883238323.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/lerolubabawutaxepipul.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/xazabesebozojuwawakujak.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/503173027.pdfIn PDF document text
    • https://rosycaffe.com/file/10151036471.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/14315087068.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/17204098449.pdfIn PDF document text
    • http://rinsacars.com/files/others/68560225851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=astro+vision+android+appPDF 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_off0000c21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21D 10252 bytes
SHA-256: b51d5e8baeeeec7d367a017a9aeb53f054649c4657d6ffd497ff7d0426061217
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 16940 bytes
SHA-256: 8dd7807fd09e620b3a2cc764f380e306d15ea2bdb6218ddb113cb91a89b0bb72