Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9856ca3981c3316…

MALICIOUS

PDF

72.6 KB Created: 2021-09-15 22:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1915ab5404cf5fc655fca9383dec502a SHA-1: 336dd45d4ce059ac51d70d04f0193638a60c3836 SHA-256: f9856ca3981c3316348b829e5e65997b99b654eb4929bec7ecd166fb6a3f7630
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable hosting, suggests it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination or host many phishing/malware pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=wipe+cache+partition+moto+g5+plus PDF link annotation
    • http://air-separation-supplier.com/d/files/42907987419.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/wamupakarinojegerabo.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/16749250768.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/tuxevovis.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/11471420402.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/kopim.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/fopokogireg.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfdf91696---busulalawotaruzakari.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/bufesogikukusovipunoki.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/46137597161.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/80109769583.pdfIn PDF document text
    • https://signika.pl/Upload/file/fasebufufupabapen.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/furisunixexufonevozexu.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/pomizetam.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/17200619176.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/raniwepifules.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/82127637542.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/zipawub.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/meteji.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/84646091657.pdfIn PDF document text
    • http://decorstore.eu/upload/file/zivobezax.pdfIn PDF document text
    • https://lordoptika.hu/files/files/nazofabox.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/tajok.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_off0000b99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99E 16244 bytes
SHA-256: cbbff27f0a430a1c372114b043b19d2d82374568f16e908e21adce541c1f5a4a
font_01_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 11048 bytes
SHA-256: 985e3c73f205f2cfdc895d2128ad28b1fb5b709f3a391cab238382e6b44dc60a
font_02_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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