Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4337db89e53a099…

MALICIOUS

PDF

71.4 KB Created: 2021-02-27 13:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a212c7fd243fe2aa3a660d132b77a158 SHA-1: d39394804f47e64858bdf655e2aeeecc0d3ce8e8 SHA-256: e4337db89e53a0991598f1e97207724f2248a5cd99189483fb8d464aa6bc741d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/aws?utm_term=my+sony+tv+remote+stopped+working PDF link annotation
    • http://bovewitavivebu.getenjoyment.net/renepaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/hbidjly/42539364404.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/how_do_i_use_my_instant_pot_duo_evo_plus.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/is_autocad_3d_software.pdfIn PDF document text
    • http://solhq.xyz/lepatatiwegucvn.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/ahh9jaV/don_t_rush_meaning_song.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/27539589931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/imax_b6ac_dual_power_manual_en_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/86620031867.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/acrobat_reader_dc_for_windows_free.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/27017033252.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 5360 bytes
SHA-256: 76334f6e4c35b16e036eb2267fbdbe2ec29d854be2a9dc0e587f160768059856
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 11356 bytes
SHA-256: f4151ff0510494377c56a972a3df67d4ad89336f8e19dcd681e3f17639345521

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