Malicious PDF — malware analysis report

Static analysis result for SHA-256 9015a633ba403cd4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 05:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9fb9a90b4893e6f5824eba87c8ea5c05 SHA-1: 4ee082974061c18975015b590c3a54fa70b0fe8c SHA-256: 9015a633ba403cd4f5b34d0b8b76739cca32febe3a1f5bd0cceaf7d92a1b40d2
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=naruto+shippuden+494 PDF link annotation
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/kedoxutemamezopemovubeson.pdfIn PDF document text
    • http://weingut-suppan.at/files/39652729626.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109211953209044.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/9118607687.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/80555350721.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/41741965748.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/xidazawiku.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/selowafegujopedegemixa.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/rupunad.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/zuraji.pdfIn PDF document text
    • http://termocity.by/pics/files/sajubum.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/zodumubevobijubuxavavi.pdfIn PDF document text
    • https://mollis.rs/files/xisevewosifoji.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/pofigolumenulolen.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/13869804342.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/xunafiwipakiriviga.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/35404666784.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/xasuxorimanako.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/16734321736.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/pamavalida.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/vodusesakutukiberela.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/32642921802.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614a07ca3ef10---dalexuzo.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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10764 bytes
SHA-256: 70eaad7be4256937025034707063760e8672a841cf1eda56ce6894ddc4c0b0d9
font_02_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 19468 bytes
SHA-256: 82e11b1fc21caf321bb2fb115122696ce93907f53c5fd2d38e4c7819f4a44e65

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