Malicious PDF — malware analysis report

Static analysis result for SHA-256 754f16557e69b57f…

MALICIOUS

PDF

83.3 KB Created: 2021-10-06 15:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 448eef3baa7ccfbe6dec3455a60e72ee SHA-1: f420f095437822e028ab84686fb2a79c21d4d5c8 SHA-256: 754f16557e69b57f2475984813c34703d43cb96a626e76d5dc078251a5e72948
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous external URIs, many of which point to potentially disposable domains, suggesting a link farm designed to obscure the true destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://occahomesearch.com/userfiles/files/bogibatebuxarof.pdf In PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/88628072164.pdfIn PDF document text
    • https://gornjastubica.hr/files/90873558335.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/rufewoxudajefaxozunomube.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/64763197150.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/65432210731.pdfIn PDF document text
    • http://npas.ru/pic/file/7507279806.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/26779528590.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/28173394101.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/86183745268.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tasakimitod.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/wawubuleponiribiditoguw.pdfIn PDF document text
    • http://konberdbio.com/upload/files/84405839963.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/38417135063.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/venajiwutemogug.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/mibazowozufusug.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615428466bbc6---figobepujiso.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/puxemelitopawamimonug.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/68448629019.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/gefatutelose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pioneer+ts+wx210a+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 10852 bytes
SHA-256: 9e56d86d37462e4c879623af4666a6768dadfae3bbadb8c5ab0328f2ee7bc331
font_01_sfnt_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 18444 bytes
SHA-256: f793bf8c9c6a9768c6fa1b17d51a35b54e354d15663f3451dd7aba6273a485ee
font_02_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d

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