Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b937d4a6cc85dd4…

MALICIOUS

PDF

112.0 KB Created: 2021-03-26 00:11:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9216fcb07d66530ac746f4583fece971 SHA-1: 5f80d19f5a66715e883e4007a633771bf69c3b65 SHA-256: 4b937d4a6cc85dd4f733dde3ab304ee2541b87f4b1c45d3add55ba671e694cb1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded URLs pointing to suspicious domains, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and embedded content, despite being obfuscated, align with phishing or malware distribution tactics.

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://seumenha.ru/award?keyword=l+histoire+de+blanche+neige+pdf PDF link annotation
    • http://trysol.xyz/58562934566zalso.pdfIn PDF document text
    • http://maska-respirator.com/ganga_action_plan_case_study6n8yl.pdfIn PDF document text
    • http://barbanapoli.moscow/93870256315crubt.pdfIn PDF document text
    • http://jewlgems.com/definition_of_safe_haven_psychologyyng57.pdfIn PDF document text
    • http://invitesistem.ru/libojesepupamakipirq.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/beautiful_nubia_all_songs.pdfIn PDF document text
    • http://teachost.com/2067619813081avm.pdfIn PDF document text
    • http://dixunawizodel.iblogger.org/nafawobumo.pdfIn PDF document text
    • http://kufizuvepopes.22web.org/paturufivoko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://werodusemojugo.epizy.com/where_is_the_sim_card_on_the_verizon_jetpack.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/pro_action_a105qw_washing_machine_manual.pdfIn PDF document text
    • http://jaziwovapotulit.epizy.com/guxowokisosaz.pdfIn PDF document text
    • http://momerizimapunu.epizy.com/vowako.pdfIn PDF document text
    • http://biviroromu.rf.gd/chief_information_officer_branch_government_of_canada.pdfIn PDF document text
    • http://nekezoxugi.rf.gd/skype_for_business_server_2019.pdfIn PDF document text
    • http://daguvenirekeb.epizy.com/96797970858.pdfIn PDF document text
    • http://xazogugikuriwox.rf.gd/37078362995.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/80897255493.pdfIn PDF document text
    • http://zinimivozu.rf.gd/vuvibenapamedamenarata.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/kirik_party_movie_belageddu_song_ringtone.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_off00016ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC6 5496 bytes
SHA-256: 159358bb848f8f8c880e4deab629ff9b7e8138fc25e1ebc31b7eec856b6aabd8
font_01_sfnt_off00017d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D6D 17860 bytes
SHA-256: d0527d21a8d7e5fbef86ca23dad9b5cf4dd055ad9a00d41ea3901f17c7564a16

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