Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23c6489e3982a0c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 11:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae115876ca270b40c01dee35c25e3e03 SHA-1: 3e5b66bfa4d1050449264b7284aa635623b8be3e SHA-256: a23c6489e3982a0c8c9d98e60cca722a6bde7b837e543153265d44b94273182f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=perfect+match+novel
    • http://vytvarnyobchod.cz/UserFiles/File/noxejagadafutizim.pdf
    • http://vongtaygiay.net/media/ftp/file/kitofapaxagemizona.pdf
    • http://www.gulbaharsigorta.com/contentData/file/94591210581.pdf
    • http://longtra.vn/userfiles/file/jokokeguwelodiwupidejig.pdf
    • http://friulanamarmi.it/images/file/zisufolurofapup.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/61617678651.pdf
    • http://stroykap.com/application/views/stroykap/userfiles/file/bokifipenoda.pdf
    • http://chroscina.com/userfiles/file/xisenanekuvarisuluja.pdf
    • http://yoga-privates.com/yoga-privates/file/suraxipoz.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/nubupetituvukusuwax.pdf
    • http://tpdw.pl/userfiles/file/wizamemugokewodizevi.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48324250906.pdf
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xuzosujenerimupetivonumu.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nfvpmuehs2lv1ee1t6cbt09emp/47329519178.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/vivowurosuviza.pdf
    • http://www.oomewatersport.nl/upload/files/58911240235.pdf
    • http://vom-ragnaroek.de/uploads/file/99423139102.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16145ed8858bb5---27340720983.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/91217376223.pdf
    • http://szyoujin.com/UploadFile/file/20210925111752657.pdf
    • http://vitrine-prof.com/files/23174583077.pdf
    • http://urdu-hadith.com/survey/userfiles/files/mavunebikebum.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/87565605639.pdf
    • http://cuahuyhoang.com/media/ftp/file/55099098185.pdf
    • http://baohanhranghm.com/upload/img/files/20739734375.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b164.bin
dd87a6f8d629ac3186c83bc65840d26b631f9acc3cb4764fd2c9d69f291cc19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB164 10408 bytes
font_01_sfnt_off0000c8cd.bin
191f30467f664b5d8b3e2c9c5d71c2a862dbee8a6d1ca892b161e8f057402ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 16892 bytes
font_02_sfnt_off0000f3ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 16792 bytes

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