Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1686bb334aa208…

MALICIOUS

PDF

75.9 KB Created: 2021-02-12 09:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 08bb7eef1522278731f93437a249e768 SHA-1: 9ef9516cca5670245c5a5c52f967672c16ed4f5c SHA-256: 8a1686bb334aa20853085e35dedea547c9d6aea058f492ff3a79f71356a3ffc6
192 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although the document body is heavily obfuscated, the presence of links and the heuristic findings point towards a social engineering attack designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/123?utm_term=poems+with+allusions+to+greek+mythology In PDF document text
    • https://cdn.sqhk.co/bamikalagov/fJhj2Hs/online_java_application_compiler.pdfIn PDF document text
    • https://cdn.sqhk.co/bipadifudame/jeFhhw9/solar_system_planets_in_order_mnemonic.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/hdFBI3Y/29290742768.pdfIn PDF document text
    • http://forexgeeks.net/341438890165pjdd.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/jiicmSL/lifebook_diary_journal_mood_tracker_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/hcfIlfw/chargepoint_income_statement.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/jjFgjhh/sigokepupitinezilexovi.pdfIn PDF document text
    • http://natlab.ru/catalogo_de_pernos_y_tuercasbiblv.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/0IBiihc/program_ludo_game.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/FQidNi5/recargar_celular_claro_online.pdfIn PDF document text
    • http://nesobaka3.xyz/lodezisi4qxdp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zofekaxezujujom.rf.gd/abrsm_piano_grade_8_scales.pdfIn PDF document text
    • http://nemevefer.rf.gd/gakazak.pdfIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/kaspersky_antivirus_3_months_trial_free.pdfIn PDF document text
    • http://rokabimokow.rf.gd/soundcloud_mod_apk_android.pdfIn PDF document text
    • http://wexereza.rf.gd/kozudivemug.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_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 5360 bytes
SHA-256: 4ee676066f2ad71448ab12966a382c10cba750f182b0d521416cd8d238430c9c
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 10076 bytes
SHA-256: b930d03a88d5b9e0e1d8933a1e601439613b4a139add74552a4c75e0a72998ea

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