Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4038ac982d74508…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 19:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 165fba68fd37cf076ae798daa7ce72bc SHA-1: eaf7c01bfc4b2f0bbad7755aef8e97a762cb57f6 SHA-256: b4038ac982d74508c02502b876ffa454bb9223378d8c5b14a62d55675d42b829
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://chcial.ru/uplcv?utm_term=install+kali+linux+in+termux+commands PDF link annotation
    • http://clinicaveterinariabilancino.it/userfiles/files/dapizivemoxupe.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/situvekular.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/98667730238.pdfIn PDF document text
    • http://efsanepin.com/calisma2/files/uploads/sepisonolevegapoku.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/zexedapup.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/nejego.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/zakuv.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/60321122439.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/80213855133.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/57705596437.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/gibakonetat.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/28305030086.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/10458432998.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/66417123098.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/bazapezabag.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/mukenuxijexufevoke.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/35300164957.pdfIn PDF document text
    • http://montesantangelo.it/files/files/56778875568.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vowopasome.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/jusugidekozirulurusukirik.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/luxidajikusafunuja.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 18860 bytes
SHA-256: 8641f4f67ce7448a29047d5400eeb0d8fa1951e14ef72e8949797252723b4b11
font_02_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 10776 bytes
SHA-256: 4bae43733d8c23fcd3059fa2baf02813c982d5249b4a53f554b2456f1e55be89

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