Malicious PDF — malware analysis report

Static analysis result for SHA-256 8547e405e783a92e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 22:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df6931198cac172e71db4656c4a6513e SHA-1: 2ecfd88b16d7a48cc79453d5bdc00c03f5ef6bfe SHA-256: 8547e405e783a92ed51d9cf4c05d87fe313e457e471095b4e51e583714274652
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=head+soccer+flash+game', likely serve as entry points for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=head+soccer+flash+game PDF link annotation
    • http://cuatro-pr.org/sites/default/files/file/filanip.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/20137820390.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/xolivagukivowujizi.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/90630414616.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/lizadatonasijibofogexer.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/64233764318.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/79719507911.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/8921146615.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/19685050274.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/73323183919.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/4583110566.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/24775762147.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/reluxido.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/zawugagitomefatarukabip.pdfIn PDF document text
    • http://aurora-c.jp/files/files/gomimefoselamatejem.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/53996143209.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/272af9rigf0c2sq5heq11lkkm0/34843193750.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/95303043657.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/tupilogosatemu.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/fuxovepisabukujuvebodon.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/bejemumegofini.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///xaridanorakulimexelo.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/19706871959.pdfIn PDF document text
    • https://slide-bearing.com/d/files/65733007677.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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 17704 bytes
SHA-256: 121e9b11a90a693352f70dfb03698f95dc50408f760bad9b378723a56fb16be5
font_02_sfnt_off000129d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 10620 bytes
SHA-256: 5080dcf1c2796b5914000e283e6c6022e332b9162d5ef09555803ea410927c88

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