Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbd9137151291c5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 02:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2aa75b95bd464809f2c3f020f5e4dbee SHA-1: aeefb330595b6aad29f3d0b8f05b73e646222389 SHA-256: 5fbd9137151291c58b1d2cdf6daadbe5d723066f9c01507381da63e3a48cca61
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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 http://master-stroi76.ru/userfiles/file/nuxokalowewexonutoxebalaf.pdf In PDF document text
    • https://gonguyenkhoi.vn/upload/files/38531133078.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/75329277631.pdfIn PDF document text
    • https://emenu.hu/editor_up/mibemajubebid.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/91719364347.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/funozopivugixorexabuves.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/6213321710.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/49257629167.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/nonewekudorapodavozex.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/bezunavederonibabawegikop.pdfIn PDF document text
    • https://medius.sk/userfiles/file/vusoxesagaroruvodomegex.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa39d6f66---nowepavegavutuzibiranog.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/lazafa.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/51189194160.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/72258580946.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/lubirejidipemumodanutane.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/70070519048.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/lekipovamasazix.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/46868389345.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/32386001883.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/dologana.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/q1i718ui062lkt9djhl2i5us2s/nokokidudodetuvixa.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/7582773381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=comics+premium+apkPDF 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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 17248 bytes
SHA-256: 97b18f9f8e8e26ef66dfc83bc4a95741c2f0a07f6a8ba39015148884c1448ef7
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 10512 bytes
SHA-256: 38ba425d65ae5b16cad5c1c513b817bb7dd44101eba5d7611cda09bc641ff51e

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