Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c15b7ae2c4e387d…

MALICIOUS

PDF

68.8 KB Created: 2021-02-16 21:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 32c5e3f20303c07d89626c0780fc4895 SHA-1: 8a7fd3ce9c5816efdb725e3e07c37652fe76ed13 SHA-256: 5c15b7ae2c4e387dcc56aed0f2e712840d5bf1967e5a803b415f31da9d851dad
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that redirect to a link farm, ultimately leading to a Tetris APK download lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm on disposable hosting, reinforcing the phishing or scam nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+to+use+cuisinart+food+processor+shredding+disc PDF link annotation
    • https://cdn.sqhk.co/kuzaxepigi/gcibjfS/tetris_apk_no_ads.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/printable_dot_journal_pageshx8ac.pdfIn PDF document text
    • http://boothattendant.com/totutapepozuwugtlqyb.pdfIn PDF document text
    • http://rentline.pro/770704246059e5mb.pdfIn PDF document text
    • http://fruktovik.com/dj_song_mix_software_for_pcys6nk.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/fMpiagf/ct_license_plate_owner_lookup_free.pdfIn PDF document text
    • http://health2health.online/how_to_write_a_poetry_book_in_wordy4l4m.pdfIn PDF document text
    • http://birjand.design/laponaralodidiberusi2li53.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/jijzpMZ/62446125730.pdfIn PDF document text
    • http://pimuxiv.22web.org/bpsc_ae_mechanical_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/eThcifI/jofelibaparesixusuxev.pdfIn PDF document text
    • https://cdn.sqhk.co/sofuxizago/t3c6ghx/last_day_on_earth_survival.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guvovigo/34501846166.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/denegi.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/77551150577.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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 5440 bytes
SHA-256: 544058a5f0351c549054822ca77751606d16d620791f129a3733e184f74ce743
font_01_sfnt_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 11084 bytes
SHA-256: 93b1885c56ea5158b1f4c657af6c6d583e1e36787a53d1237c7b41669bcebfef

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