Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07470c25f69828b…

MALICIOUS

PDF

89.8 KB Created: 2021-09-19 21:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c58ff3ec5d19d6b7f9c9201bc3dfeb76 SHA-1: 3540444acfbe154bc5f97b22874b6d6b49c10e5f SHA-256: c07470c25f69828bac832f27960de803e99ef5e8a57ef6ba3af7eb148c0fdb9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=hanuman+chalisa+english+written PDF link annotation
    • http://lifeline-sports.com/files/file/91737063807.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/gesujaxedabaji.pdfIn PDF document text
    • https://lorus.rs/files/70831119338.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/45804784163.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tojufavujepexeriz.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/7819759421.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/titevukuwefitijupiv.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/dilifamaf.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/noduzuvovarokeposu.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/gomixutisubezulesifo.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/lupogaba.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/kuwagagoxo.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/retifu.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/57538121816.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/jebebeteko.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/20532113101.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/46171951181.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/51440998644.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/83256785105.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/99909887496.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/46054383253.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/kaxubiveborus.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/76830275920.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/94241010920.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/nazotelezasapakebeliwiko.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_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 10732 bytes
SHA-256: 370634cf64336d4519d841fea9d81f945136269ffb19202d9e6740076c06f155
font_02_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 19444 bytes
SHA-256: b29c633180e906ec87d5fd2cfb7509a574aebf0e8026bd872deaae50531e3f72

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