Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ce334efc3d91ce…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 03:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35caaa127135c286166c702d948f5966 SHA-1: f40d3da72c75277ecc5caa16d0f8c8d197c9dc16 SHA-256: 82ce334efc3d91ce228faca4d8859ea74fb0b54f3e527d472ba939e2f0868d36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various domains, many of which are associated with link farms and disposable hosting. This behavior, combined with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=ninja+moba+5v5+mod+apk PDF link annotation
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/49065714923.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/41872962913.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/xemizeto.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/61465841154.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jikisumiko.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/tubopa.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/52181476754.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/16070799779.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/55523829260.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/24344992189.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/21072867165.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/janigiditadajon.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137812d56432---58122560756.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/67195104722.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/76708971786.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/66727221002.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/38691410230.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/66657175083.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/rivuzaxotupiluposetexa.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xexiwotoxuxadila.pdfIn PDF document text
    • https://777mto.org/contents/files/17947369173.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/26321591526.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kesezilolapunuli.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_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 20000 bytes
SHA-256: de802f09e6f0043e0b351a4a3ec87e7270e7bd5db9963c28f91e70cfb41213cb
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10548 bytes
SHA-256: 8ebeefd36809f6828594c8f43fdec06c5145c42a1bdd037eb8ffaabb0537db59
font_02_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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