Malicious PDF — malware analysis report

Static analysis result for SHA-256 470288f744ae3bf2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 05:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9df60b2cedbc32bc94635d358f5979da SHA-1: 23e36231a39c750540767885aff981f3767208ff SHA-256: 470288f744ae3bf27c687f9d85eae3128ea07f135081ed35b65346d1dd3ccdc6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous external links, many pointing to unknown domains, suggests a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and associated heuristics point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ozanatalan.com/iboard/includes/userfiles/files/wekisopidevewuze.pdf In PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/50423512235.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/62811058857.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/56431823587.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/dasig.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030837079557.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/43042964060.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/xokuxovanezupevepivoturo.pdfIn PDF document text
    • https://foulardfotografando.it/file/81794542824.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/519654429.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/xikuwuzadijojudawe.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/supapufifosuramoputazu.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/26085654175.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c8cf608484a82956b267779cdde27dd0/67602967350.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/vukir.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/punuzepogirirolaran.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ruwupujisavufenezaxivaz.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/47580457863.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109060322393004.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f289fdcf86---rifosedozeburig.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109041751373913.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/paguzumerinadekovagezina.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/fulirimuwexesaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=windows+7+image+iso+file+downloadPDF 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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 10628 bytes
SHA-256: 2dd77c232cf74b02ff6fd8a3baeecbf308b3d9a8036057c4c6cc959f98e62a53
font_02_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 18828 bytes
SHA-256: 665d6bcea85148f76c1485ff4a19c44d9453809ccd18a625942078ce56f3dd6e