Malicious PDF — malware analysis report

Static analysis result for SHA-256 380b6f3fc701ccb6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 18:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8ec8e3dcc94fe42e116b7636e46d43f4 SHA-1: 4b2b85128bd823acf04d95a05a7504338c9e638f SHA-256: 380b6f3fc701ccb6595bda529ed87ca26897f733f72c34e87715ac6cf3eb2f7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a high heuristic score for being a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF's structure and the presence of external URIs point towards a spearphishing attachment, likely exploiting a vulnerability to execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://andrenickels.de/ckfinder/userfiles/files/96664222530.pdf In PDF document text
    • http://gachbinhduong.com/upload/file/misidade.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/dujafipimijufil.pdfIn PDF document text
    • http://robedecreateur.com/img/files/pakanelaxatejojegigu.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210904170949.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/62238245405.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/mojogigusejivotoxipimula.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/76810981268.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/wazosoliradowi.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/22992377513.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zowukuteloginapisuvux.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kasutonuzepirepopadi.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/vetadopimogidanezubejuja.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/nuzevufum.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/gewiregexirelol.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/tifapikoginavunoro.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wijeledalokexonulewika.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/42125012973.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/futobebikirufibixogujaro.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388647b490f---ladokewakumufokipupeko.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/39971940874.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/devebaduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=british+english+dictionary+pdfPDF 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_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 17348 bytes
SHA-256: 10fbe589c9fee36ee4c1bbe690a9ebdfeade72f198151966c67c6957b6f390b8
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 11064 bytes
SHA-256: 84b10b16c9d5f36a7aed780cfdfb9114d92bded63e4416e900f53ddbdbdcda02