Malicious PDF — malware analysis report

Static analysis result for SHA-256 2646a38efd9ccc40…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 18:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9b5751be3afd504c84fcaf325aacd20 SHA-1: a5e75a3a294deb58ad9164f2e534008e9e42c371 SHA-256: 2646a38efd9ccc40a12d4716ca7fc1a54941c2d88c4f951bf64298ab22f574e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://paintmaster.hu/js/ckfinder/userfiles/files/4069615164.pdf In PDF document text
    • http://canxetaianhduc.com/images/file/mibep.pdfIn PDF document text
    • http://contextuae.com/resimler/files/95161884688.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/19488591269.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138197a40a89---gokosasenezitenuxilut.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/xekelifox.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/gikolowavadegezepeviw.pdfIn PDF document text
    • https://gdaniec.com/upload/files/27076559205.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/90794930090.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/ziwulepuzema.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/golesamujukedas.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210901_8_17_47.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/4040376308.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/kejumolixusideso.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/wewajulurupeneganiput.pdfIn PDF document text
    • https://empresa-venta.hr/files/muwupefufekigawezapiwil.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/32741894593.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/mugisifebipovemasufi.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/30580685406.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/92010564330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=s10+lite+android+versionPDF 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_off0000b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AA 10556 bytes
SHA-256: 0375cc02fd5d0670b00222d05f7edcc3c6ebdc703e153db805fe2c80dc6e3425
font_01_sfnt_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 15792 bytes
SHA-256: 700183c5632495218978ccb91f2e3ccc3198ce8e5e80558f39728d3ab48a8404

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