Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71bf7bc676778d6…

MALICIOUS

PDF

79.4 KB Created: 2021-03-07 22:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0d46aa34817dc9dee6bc6cc6996e655f SHA-1: bc2c2523b50713e5d6e6ff0a365366be54b07158 SHA-256: d71bf7bc676778d6f563fb107cabe5c1a5f7191472cd500788a56b3680846c7f
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/strik?utm_term=sketchup+shortcut+key+for+pan PDF link annotation
    • http://nakomajuvedina.iblogger.org/english_vocabulary_list_with_tamil_meaning.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/cosco_high_back_booster_car_seat_pink.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_603a719c72ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_6027edf8afd46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_603dec2932c52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454544/normal_5ff65d90182ec.pdfIn PDF document text
    • http://kigurumi.org/canon_mx922_manualcy8ot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_6000c048283b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418993/normal_5ff0962c54c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_60430db82fb65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5fe74c0cf2d47.pdfIn PDF document text
    • http://chelobaka.space/justice_court_clerk_study_guidea1omj.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/watch_you_got_me_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_6031ff5b6554a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_601fb953eec70.pdfIn PDF document text
    • http://berkeciftci.net/runasodegodllsvt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wumugajus.onlinewebshop.net/cfa_level_1_registration_deadline_december_2019.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_1fb02eff68aa46c8af2951f0566c10c7.pdf?index=trueIn PDF document text
    • http://jaweratiz.atwebpages.com/xovuzutozekotuwavevoro.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_6afe2ea86be24c1489d6873d0cc3c1af.pdf?index=trueIn PDF document text
    • http://bepenaguvofiw.epizy.com/meboduvutezuror.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_34c22cfc81b14763af55ae75cf85e964.pdf?index=trueIn PDF document text
    • http://dapizodipe.myartsonline.com/call_of_duty_wwii_xbox_one_digital_download.pdfIn PDF document text
    • http://sewasijibakel.epizy.com/libatake.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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5340 bytes
SHA-256: 30c13f9543c47d2ee7553e42feac2716437b5cda4f585b800073048326a338b7
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 11600 bytes
SHA-256: 945964727a3f7590a909961aaed4262bb7a21693052705393e1290267a995ab1