Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81142e9cb128e93…

MALICIOUS

PDF

71.0 KB Created: 2020-12-26 16:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9d69575a4400e8a139474c61f297cb2d SHA-1: 739ff84e3349b54fb20859bd9df56cba94268c72 SHA-256: e81142e9cb128e933cc5cb5335c8ed4c4ed03aaad41413edc5eee4137e40363c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The 'SE_INVOICE_LURE' heuristic suggests a fake invoice or payment pretext. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malicious payload delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffset.ru/aws?utm_term=development+plan+template+powerpoint PDF link annotation
    • https://cdn.sqhk.co/lewivapawo/ijaNagj/pancake_recipes_dairy_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/R5EKibJ/skater_skirt_formal_dress.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/bubuxakosugafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/sexibumal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3781a84-a20b-4632-8197-40039b98905c/wordpress_admin_login_too_many_redirects.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/54321655804.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/anemia_falciforme_resumo.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/wuvizekufotize.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/comparative_anatomy_of_kidney_in_vertebrates.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/ziziloregimivolajanusedil.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/josofujewiwevone.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/basic_elements_of_communication_system.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/vidmate_hd_movie_er_apk.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 4936 bytes
SHA-256: 6980e9b82827b9052396ce197adb5caa1eddeec6c1423ddbdd94c530250db02d
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 10068 bytes
SHA-256: 4b6b7f9843afd44efdc328e76c47a28deb29ff2cdcf301f97bf618cad33ad5ce

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