Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdede42cbc579ea4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 01:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0dbeb1e3a85fb17f7a7ab08da97e6847 SHA-1: 06a5924e92cef3a178a4ecb921305f4984859797 SHA-256: bdede42cbc579ea418a0f29c897d4569cc7822ece459ade58fe89aea484fbfe3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm on disposable hosting, with numerous embedded URLs pointing to other PDF files, suggesting a phishing or malware distribution lure. The presence of a download button heuristic further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://nexxosrealty.com/userfiles/files/katidezavilor.pdf In PDF document text
    • http://german-ex.com/images/blog/file/44250373328.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/681530433.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/vejotudadutukonawoxaxo.pdfIn PDF document text
    • http://standdominica.org/files/files/48826268963.pdfIn PDF document text
    • http://upakuika.com/img/file/zozefutosawadenod.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/zuvenomafexiwov.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/41820426223.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/36680629890.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/23826566947.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/36464999930.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/86972579238.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/sugoxunelexovutinad.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/27330458994.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/fodiruxufoda.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/nukatixozed.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/sokuze.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/21611922658.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/88414486586.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/89079877340.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/zifin.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cad0e6e030---61646476134.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/60974225049.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/41612315843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=batman+telltale+mod+apkPDF 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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 10336 bytes
SHA-256: 193ecba077efc0416eb53623deeedb73d1e3d70d799ef8ee1ba5434283dfe649
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 19100 bytes
SHA-256: 0d48e28a73080fd3e6b1b93f83555b8bc5ff7fa862d4db4742cee7c797bee09c