Malicious PDF — malware analysis report

Static analysis result for SHA-256 770d18448440811a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 20:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2462e96db971ccccafe05777ef25c7b SHA-1: ccf586fb711ca3208cbf94562b145288e4a2d513 SHA-256: 770d18448440811a810877b7d5997072e769b1693276fb64496e824db9578aba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=jingle+bells+sheet+music+pdf PDF link annotation
    • http://chothuexeninhbinh.net/data/dulieu/files/gikosafedafumi.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/75199127351.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/31874399990.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbd97d29d0---zabupemeliret.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/59633662756.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/wiwirulovijepexawiloxad.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/visesasodufibunuxomuxi.pdfIn PDF document text
    • http://mfcpavpos.ru/file/55038177792.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/larituguz.pdfIn PDF document text
    • http://samtekelektrik.com/files/pemize.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/92202326431.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/dalolaboferejijiwajopek.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/viriguniwosijewefizugafi.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/kanusadawitibiboxamodofub.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/46806652784.pdfIn PDF document text
    • http://etkenkalip.com/files/jutirerifu.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/89696064753.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/47938296372.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/giwixexile.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jodobazometadizonulujeg.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/dirarujiviredukilujofoku.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/supawelu.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/rikatogafaxa.pdfIn PDF document text
    • https://olterus.com/contents/files/kuvofasanir.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_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 17940 bytes
SHA-256: 8a0e0982d389279c2d6ab62756e6a6a8e225704a5871b0e98f6ed15c75335b11
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 10916 bytes
SHA-256: 8fd9d88b8bce4d3cc734c336572927888ce5b9b7163056f9bca45214275e46ef
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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