Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0e418cfe9e4b63…

MALICIOUS

PDF

67.4 KB Created: 2021-09-14 15:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8c87ed0a65765af6513553bbcafa822d SHA-1: b5a09b228f2bb085dbdc99bf499fc4f1824bd182 SHA-256: 8e0e418cfe9e4b633a39c65779a38b4fdaeb006732fcccef12994f6ae020622d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=bestie+camera+apk+old+version PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kokejabukid.pdfIn PDF document text
    • https://dellrein.ru/content/file/difulot.pdfIn PDF document text
    • http://hydrem.ru/images/file/ruvukebefefupusuvopan.pdfIn PDF document text
    • https://novitas.ro/files/vizakeda.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/31892119627.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/86918788670.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/27400868174.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bb413dfdef802aadd89b5da2ca05c7ef/7768561597.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/6739518326.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/25767213145.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210908135336187.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/62727169594.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/foberobawim.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/gexoxizana.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/28737628304.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/wozevoninewa.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/fomeneta.pdfIn PDF document text
    • http://maksimetall.ru/files/jokesezodamudisinibale.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/89753b44efcce744bf8bd207d6050cfc/xumomivofagusopozibuxi.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/lezudogevokasi.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_off0000a98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA98F 10888 bytes
SHA-256: 34471c297ab94a5c3ef76ec3647dd04f556507b77d476b75ddd45fe51f2e5886
font_01_sfnt_off0000c2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 14624 bytes
SHA-256: 2b4c407a23c1dd7b00b97d131189fda1b0800e628415f58042c6d02cc9606442

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