Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40433fa8734b377…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 05:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13c7d8d97fc1000eebd474ea7d002bf3 SHA-1: afe1d5fc68f60d26c02c371cea71839976451e82 SHA-256: e40433fa8734b377cd556a6cdff8c01003d5c620efacdc61745a7d364a5d0e18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains or are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious sites.

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://archism.ru/uplcv?utm_term=nepali+tv+app+for+android PDF link annotation
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/raxogunu.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/jixegaxibatexigit.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/jazunovegosesiluxedexuxa.pdfIn PDF document text
    • http://northcity.rs/slike/files/xafemoku.pdfIn PDF document text
    • http://gibisch.biz/files/files/ziworijixojisewog.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/29098131227.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/31972100298.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/gilevup.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/taruketazerugerab.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/63069051443.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/57286007884.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/18022831681.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/60386761159.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mukizivapasi.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/91823439675.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/mubujezoxesefirukesig.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/68424038637.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/7304407231.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/20147236306.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d45479345d---zokix.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/zuxijoturukovedabajiwafav.pdfIn PDF document text
    • http://juha.be/_files/file/3400956932.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/67fceb5a15f420c24d51b373cb438a7f/30180527937.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_off0000b413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 19072 bytes
SHA-256: c82a6ef3f51308b4f00960413116cf1d882203bfd72ed082117de6e5dba26727
font_02_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10364 bytes
SHA-256: e45a1dbd96e19b531568dbdba2a78cb88a2e3b38e75b7d229782fbdf1b8e6e12

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