Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07463406c6fe465…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 11:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f9987fa795d830fcf51bd4708113ae81 SHA-1: 8ce5ceea15e7142144aa01f9f0786a8c55a5dc94 SHA-256: b07463406c6fe4656c654b24a30d13f66c3494bb625e4b2b26accca784ec23f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic identified it as a link farm designed for disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://mr-alian.com/upload/ckfinder/files/roxixukiv.pdf In PDF document text
    • https://alev.az/userfiles/file/82119446969.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/rufubarupak.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/kuvozovaj.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/kodelumujinewefepiwukojob.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/63980898262.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614022941e9a8---57311099981.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/25306193731.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/82151384147.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/foxoxubamowaribe.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/2017505082.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/24863061796.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dekejiriwedup.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/84714873360.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210912115850_gyyery.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/wonor.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/29242352403.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99e3b8c3e---piwugeletogubumegi.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/11992136031.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/35962541236.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/49727863731.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/85988406825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=rolling+sky+mod+apk+2021PDF 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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 23600 bytes
SHA-256: a9f20da46572668cd2166fb11b0c9adb0462e2de87c13e750111cbd8f1a0679a
font_01_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 10952 bytes
SHA-256: c0b54143262c59078b166a80efd97af5bc5017eb1a395aa3c0a46065b911c286
font_02_sfnt_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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