Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4d71527349bc6e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 23:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55385b711ada2a10d7c1b63c5df8fdb7 SHA-1: bc226e82d2e10ea976e221dcdbdc9b30e6b31092 SHA-256: 8d4d71527349bc6eeb72dfe630cdf5fa1f07f4e292dce249da47975dd64b7da0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect the user to malicious sites or download further payloads. The presence of a link farm heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://eklyps.net/images/file/logavosexamis.pdf In PDF document text
    • https://wita.lt/images/files/15320388073.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/69f6cb13105d8c60215ef6e6580f1f50/97627598391.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/relanoledotiwoduma.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/1715680385.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8f6e2523af8469d41cda487af71ca61a/zupasas.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/fajubetip.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/wugujuziweremol.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/lidimufuxud.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/98285759218.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109021052007005.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210920161136.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/32269184834.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109100432346012.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/34176146413.pdfIn PDF document text
    • http://live-net.it/file/jowunurenuvo.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/92896181829.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/liboxot.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/putopo.pdfIn PDF document text
    • https://sainaudit.mn/File/rijagizomogivimaka.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/43337458982.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/52201117242.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/13498929296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+nba+2k21+android+obbPDF 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_off0000b88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88B 10332 bytes
SHA-256: a55e95cfcf9fa5069362055e0912d55a7663eac93edd3be6631afd99a29f4d1d
font_01_sfnt_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 16636 bytes
SHA-256: 32035e14f32a13f4d575c93c502ea6d1072503b5162a5526394fe89bc7124d08
font_02_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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