Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de4503dd30dd71b…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 04:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6088f91cde7cfa3694578da0601b9621 SHA-1: c83559e001da65161292bbb6453e3beec85d4c9c SHA-256: 1de4503dd30dd71b31fa5d1b974774881439da71ae9e5ed8104453e82218b8c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to one of the numerous external URLs found, potentially for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://metafelix.it/userfiles/files/4147356146.pdf In PDF document text
    • https://luxm.pl/userfiles/file/14639486963.pdfIn PDF document text
    • http://etnorom.hu/pictures/fukelitajejatasolilaked.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/97288138553.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/38639898981.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/2167972100.pdfIn PDF document text
    • http://kalikraft.com/images/file/10767050656.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3decd0406---rulatudasepuvazowekape.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/palanibofifedimabipum.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109161346167581.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/95658217284.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/fumatanezixaxes.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/rodivonarumefarevud.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/88493190008.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210910_23D71523DC1B2558.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/bosanifezawad.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6858dc015---22052139730.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/21482517901.pdfIn PDF document text
    • http://fitviewer.info/files/file/rikosugobaj.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/74376608703.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/17695875610.pdfIn PDF document text
    • http://innersolutions-uk.com/file/sivonozotikumidolifenomi.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/dovumekukaberukidufo.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/69599746884.pdfIn PDF document text
    • https://coevent.ru/upload/files/nadimefitulenevogegigu.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/28116288779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+galaxy+s5+root+xdaPDF 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_off0000c07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16784 bytes
SHA-256: ab3c19410e5d370903accfd9ae54aa84578904c828af652f8411a7651a13b4c1
font_02_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 10892 bytes
SHA-256: d5d21c867deaf8acedebc6524da451d4deeb077c6f410cf82d171d4bb9119359