Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d17b8785e519a9…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 13:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff413b94e2ce3feb7b6f9506735db0d4 SHA-1: 46e1ae5d0075c37be91a97b952ffa2d8d3e8c03c SHA-256: 19d17b8785e519a9037a9ad0e7c3e830fc265b6eb8b49d44d5f0281cf54a0ba8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=download+audify+notification+reader PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614209f729f6b---daxuvuva.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091208082781.pdfIn PDF document text
    • https://glozor.com/userfiles/file/67967132757.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/segogola.pdfIn PDF document text
    • http://showdoimovel.com/files/files/72823163151.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/58674421312.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/89116749998.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/dusapilavukivekexuwax.pdfIn PDF document text
    • https://digireg.at/upload/wujefi.pdfIn PDF document text
    • http://fxlcd.com/upload/file/mokefopilujegodub.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/74274716515.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/27560236186.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/10647910610.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/tozotunusizesawepoduk.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/pufafixerirodidituvuni.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/telufazeri.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/mijosibewixunapitaw.pdfIn PDF document text
    • http://merwepizza.com/upload/file/sojudadawisesipovako.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/44576333579.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/lesogufokusaxugo.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/taxilomitovovev.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafcee4c1e---40516263377.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-11/20210911043611416520.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/63004538563.pdfIn PDF document text
    • 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_off0000c5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C2 10600 bytes
SHA-256: fd6e68686eb38b6dce5d5659b08d539f2521289c7c5d9178b33aa2a47b104d8d
font_01_sfnt_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 17600 bytes
SHA-256: 067170ff554c9f70b9c88cc600d7dd36dcd2a283ee8c1338a247000de82f04de
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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