Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d44698bef5a542…

MALICIOUS

PDF

94.9 KB Created: 2021-02-21 01:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a1248deac16781c63770a630a8389f07 SHA-1: d3196041ea42ba8378af36ca556719b42c9668ea SHA-256: 86d44698bef5a542af36fc697540b72adc5c7b8650133e632a2e3b6553a18027
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and the 'link farm' heuristic point towards the document's primary function being to redirect users to potentially harmful sites.

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://baarspo.ru/strik?utm_term=types+of+text+structure+in+literature PDF link annotation
    • http://czecheducation.space/raspberry_pi_viewercv52f.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/y6jiggf/la_reina_del_sur_cast_rocio.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/best_5e_character_sheet_appbbug6.pdfIn PDF document text
    • https://cdn.sqhk.co/naxokujim/hmTjbMM/monster_trucks_movie_2017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5fec04f4baadf.pdfIn PDF document text
    • http://vosusapar.22web.org/defending_jacob_last_episode_song.pdfIn PDF document text
    • http://verification-help.com/58888065444mn6hr.pdfIn PDF document text
    • http://harkateine.fun/80425934923z50cn.pdfIn PDF document text
    • http://tublitalia.space/pokimane_discord_ban_speedrun_rulesxz4a0.pdfIn PDF document text
    • http://larixulefil.iblogger.org/sat_physics_subject_test_practice_questions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488116/normal_6004cb7b5ad35.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/1Chf8hg/19115902800.pdfIn PDF document text
    • http://milanbeach.fun/86301211771l13no.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/icuKdhh/mewunizemuxofuwukotatem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzaxitiruxojax.epizy.com/xfinity_xr2_remote_not_working_with_sony_tv.pdfIn PDF document text
    • http://sosirowop.epizy.com/gumorebejipidavopatukuxub.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_off00013487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13487 5128 bytes
SHA-256: e49de62c4bcb5d380d496eef034fee8d98b4a7f33695c3134c204b40c1fcf0b7
font_01_sfnt_off0001461c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461C 12300 bytes
SHA-256: baf7cca2f598252f151f259e59cab1d52bc299d9e564e9e275739a575476e447