Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0b6130a063e851…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 23:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 044b0297ebb1b37fbfcb3c12aa3b76bc SHA-1: 3aae8fe537ee5bebc170179645a15ece9477650b SHA-256: ec0b6130a063e851fdbb6ff1ec4a42dd1d920ae3b048d8ba2db8b3124a5cb852
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=naruto+senki+mod+storm PDF link annotation
    • https://muguet.fr/sites/default/files/file/samorogubukonuzigawugagel.pdfIn PDF document text
    • http://muszempilla.com/files/file/tamudokozarifesilelazin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456f75d9ca4---luvagexirubib.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wasikivedatuno.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/65393511631.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/53255788431.pdfIn PDF document text
    • http://npas.ru/pic/file/4578163418.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/kobiwivat.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109201249052832.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f316693999---nikufabuzemoju.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/pizegidibazimelefel.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/60187996369.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/losawaditen.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/birejedabo.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/juwakinozepaza.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/58293428087.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/zulofipab.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/5387458775.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/jitagepene.pdfIn PDF document text
    • https://hoavily.com/uploads/files/lejuvevitazome.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/63511930696.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/49452003901.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/6594107977.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_off0000ae6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6F 16336 bytes
SHA-256: 98360c63010456d0ae1b14e03145090292b1c37e9e547e07a6a593c207d6a98d
font_01_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10532 bytes
SHA-256: b92c7cb4e5a2adff082c8492526df9b0e10f86de3c3aba0464b59e1aab5ab251

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