Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3db50128c25379e…

MALICIOUS

PDF

82.5 KB Created: 2021-03-24 20:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 40cb5d1a9736957483d76ae45a642a8e SHA-1: ba7f2d24a491a19606ad4eea7785bbb1e7069cf4 SHA-256: c3db50128c25379e58995f02eaa4024c167a8bb5b90d778bd24cb0bc4a97c614
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://fokemale.ru/strik?utm_term=ryobi+1800w+2000+psi+pressure+washer+review PDF link annotation
    • https://cdn.sqhk.co/sobexufi/ibtgiyu/26575222576.pdfIn PDF document text
    • https://tusefekojeseto.weebly.com/uploads/1/3/4/4/134437698/teduva.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/gf3uRl8/21962068734.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/iif0agh/kitchen_tools_identification_sheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/salefudodid/Rggcggj/death_incoming_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/i50hagf/pitaletiribabiwuzimoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/ihpihih/38093959376.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/AGnjbgd/pokidogotuxova.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/JjeifNk/74041775621.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/QgeiftO/depejekarewew.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/Ticibje/freeze_dried_food_storage_life.pdfIn PDF document text
    • https://mujavipaw.weebly.com/uploads/1/3/0/8/130874121/701aed91f1b.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/jzLJjix/zombie_apocalypse_2012_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/hF8fgiE/fatuxetadimevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_ef74c829d7ef4479bcb376358ea0b125.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_a7492470e3a546d4ae4ee4ed69e3dae7.pdf?index=trueIn PDF document text
    • http://fomariwidodazum.rf.gd/corel_draw_x7_activation_code_free.pdfIn PDF document text
    • http://gopudagob.epizy.com/small_business_answering_service_reviews.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_2b6ea24aeb5445998472e57090372c44.pdf?index=trueIn PDF document text
    • http://vefelazubogimew.rf.gd/dan_brown_complete_book_list.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_02f7cf62a22e47ac87ccbacaeb14f7c5.pdf?index=trueIn PDF document text
    • http://ganatovofafad.rf.gd/lexis_audio_editor_paid_free_apk.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_f0b4353b882548ad970f8bbd50f5bfc2.pdf?index=trueIn 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_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 5796 bytes
SHA-256: a3ebed9fbc6b34794346049394d204b9e3873bc2d357661bd00806b0c9219aaa
font_01_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 11168 bytes
SHA-256: a2b880bdade739f2a0c65fb963776d1d871775552579669708a499e6902754ef