Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94998a9edd43870…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 16:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7f403da7259bb32e92762012637b3d7 SHA-1: 128fc1c588f1b1874efb1d0e11ac61d5d8984e51 SHA-256: d94998a9edd43870c801bc6c8889724bb158be8dcf6298bce0babfdceea1e7ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification suggest it is designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://octapus.vn/images/uploads/files/jinonob.pdf In PDF document text
    • https://bcbc3399.com/upload/files/93022053530.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/84801700821.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/23932235932.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/ketabefij.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e5b6c9ce025026a3e298869ebff6a2d/posepodokopuzipixe.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/82866314775.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/potosuxevukunipewesuxosot.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/buxivukelaxevofovowu.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/90955225976.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/24835870552.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/60547982142.pdfIn PDF document text
    • https://lapakunited.com/contents/files/15880004164.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zipinerofigow.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/sukufow.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0a274866fd7ea2957690b4aee7a846a2/66025986704.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pakivudojifijozaxoloroxiw.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/pamotawitifakeramujak.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/wefonanen.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/66213213051.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/rekalutuwox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=viva+video+app+old+versionPDF 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_off0000bb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB96 18132 bytes
SHA-256: 9c826175fbb926fdb0ddad94fa57f165c78f6376f02518973b0a79a9f9ba1dd6
font_01_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 10324 bytes
SHA-256: 36d5ccfe7a65ce87a627a673758f52ebae34d5e347ec1e9fc48be0fa61e7dbb4

Open this report in the interactive analyzer, or submit your own file for analysis.