Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c43520bcb3f6af…

MALICIOUS

PDF

80.3 KB Created: 2021-04-15 20:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a087d17bd1db048bc7b74f716f804bf8 SHA-1: e77d17a3000bc28392cc597465e29b90ca1304a1 SHA-256: f4c43520bcb3f6affc867e3dde616d6e6c1074ff2888bbdd8cae5cd7034b3d46
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains and known malicious redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to further malicious content or phishing pages. No scripts were extracted, but the structure and embedded URLs are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=who+survives+maze+runner+death+cure In PDF document text
    • http://petrol-v-pol-price.site/bobcat_2200_service_repair_manualkmo98.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/pdf_to_word_top_software.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493209/normal_5fc93ffc14c91.pdfIn PDF document text
    • http://love-your-lips.online/vatenumimelunokojalekik12184.pdfIn PDF document text
    • http://excellent-spb.ru/63642388099w2l9r.pdfIn PDF document text
    • http://aazzzry.space/how_much_does_it_cost_to_hire_a_criminal_defense_attorneypk4ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_6012ef0c28fd4.pdfIn PDF document text
    • http://smartycredit.info/how_to_scan_epson_xp_200w647o.pdfIn PDF document text
    • http://forpost-electrica.ru/waladovuda40svo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_605f8814bbfc7.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/5518416704.pdfIn PDF document text
    • http://zijafanovidiz.sportsontheweb.net/reading_comprehension_test_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_6028251313959.pdfIn PDF document text
    • http://prognoz-football.club/oxidation_and_reduction_quizgftdf.pdfIn PDF document text
    • http://iglivesupportteam.com/747259032725luaa.pdfIn PDF document text
    • http://probnik1313.tech/atos_e_contratos_administrativos78yu1.pdfIn PDF document text
    • http://xewodatesuporob.mypressonline.com/mafumefukaro.pdfIn PDF document text
    • http://lisolu.org/jandy_lrz_pool_heater_troubleshooting_guidelcp12.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/mixed_tenses_present_past_future_exercises.pdfIn PDF document text
    • http://hesap-al-sat.com/195324233887u485.pdfIn PDF document text
    • http://idealslimitaly-official.site/python_simple_code_games365n1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 5152 bytes
SHA-256: f16567b33d17c117bcbbe0aa51e870fc96dd4528db7a7b8112aac4bf1dadf478
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 10400 bytes
SHA-256: 389adf9adad7146610a3f3dbe755317a43727cbea1ba3b035228145cbcf836f7
font_02_sfnt_off00012545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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