Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e952c7b5846611…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 15:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 440491097b1d46d70ef36c3f1d79da2e SHA-1: 31340e150f099a6fd4c67e321dc199a9cb5c4d62 SHA-256: a5e952c7b58466110a99550233b7bd11193897332e82a8ae769bed33250317b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also hosts a large number of external links, many pointing to disposable domains, indicating a potential link-farming or phishing operation designed to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://demo-calson.garment-pro.com/ckfinder/userfiles/files/38542737672.pdf In PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/66909818294.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/94528659227.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/dedukoxutazonobazisojezub.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/kadududigawuwiwa.pdfIn PDF document text
    • http://abwrva.com/uploads/files/71717636043.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/85665988410.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ub9eganksd0sq0004eho33pq7o/rilarugunobimuj.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/siwimovixipaxofaze.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/penivolobageviriwosa.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/68881069539.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/rigiluxegu.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/vijoxorugi.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/85108651105.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/seworedikemobabelirebok.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/tuzivejufixazimitituzub.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/xejakogefupub.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/45110629591.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/50911629340.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/598499857.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/sumolobuwoniluferu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210908_7B749EEDF28C7E18.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/jezogipebivexi.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/27294171133.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/107f4f086b60f31c8c0ddd8452593765/11046112910.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/miwemufujifuboma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+store+camera+photos+on+sd+cardPDF 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_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 19116 bytes
SHA-256: 015d32384fd91399df4a47f81fe7daad7d39c069f76ee25f1a24b00141a536f2
font_01_sfnt_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13077 10720 bytes
SHA-256: fe4cf1357964072ffc08a37439236cc6aa285f64f6e11dc4e8508d5f391eae0f