Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f75cf181e05c96a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 04:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a52c6219f1a628c3f2ea5954e72ab891 SHA-1: d4af23fd7ca87c934ca02443861d0d99530219cc SHA-256: 9f75cf181e05c96a8b1fa3eddda2d9b35ba6d4f0fdf8739b54c4c5d0ef5fd00c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, likely intended to obscure the final destination or increase the chances of a successful redirect. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://multiflex.ru/userfiles/file/70561946981.pdf In PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/9306131998.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/20954624690.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jafopagaworaborakadafeder.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/beluziji.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c99e26cbe---ditawodomujedugela.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903202421.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/xeledefuxoxotomirilab.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/tukefanetilusolur.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kesodagakelokipagib.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/bejavewupara.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/41916941129.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/74881416235.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/43153714723.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/fawalegafuxirobabotajotiw.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/5434369555.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/57098948816.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/41690393272.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/vezeranekigenazo.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/nonuganususovad.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/7812402209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+exit+recovery+mode+without+power+button+androidPDF link annotation
    • 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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 18696 bytes
SHA-256: 9f266aa29b930d6705214de5c4fe2bfcc7256208d0e4f08821fabae0cec17e73
font_01_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 11164 bytes
SHA-256: 3c4c136969d417c686ede9a6776dc6ef01ca0579da14cd1d1963c39d75a2d08d

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