Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6537008c113922…

MALICIOUS

PDF

75.7 KB Created: 2021-04-24 08:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9a7e22ce99c56c8fc55264c411ad8e9a SHA-1: 5a5e970eac03b76550683957e74fc830b218c858 SHA-256: 0c6537008c11392247819dc7432844d0ea179c42cef81c11d044bd1bcb569fd4
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/strik?utm_term=string+theory+david+foster+wallace+ebook PDF link annotation
    • https://zidefiwemisuj.weebly.com/uploads/1/3/1/6/131606537/7506498.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/gelitenijiloyp99w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_600bec364c70e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_605fd0df16de0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388432/normal_5ff0aa20c17a7.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/kukemixatowikosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_606e71ad46de1.pdfIn PDF document text
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/sidiwafukuxubof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_6049762ad3437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_6041a5ef375ad.pdfIn PDF document text
    • http://santaparker.store/749957893117jj8j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_60436a7ed8c5c.pdfIn PDF document text
    • http://vertitribe.store/how_to_do_well_in_competency_based_interviewsq0yeu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488582/normal_6026b1629459c.pdfIn PDF document text
    • http://firstreadersclub.com/wugegelajonaxzxys.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/how_much_does_a_water_softener_costabecn.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/wejerimopajuwiriruniw.pdfIn PDF document text
    • https://vujexuxifu.weebly.com/uploads/1/3/0/7/130739824/wagejapadir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_60401eff46a1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_6046599f848a9.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/beethoven_piano_sonata_7.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/fowoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e400665-de84-46ae-a95f-0bac7bf6e56c/maths_quiz_for_7_year_olds_uk.pdfIn PDF document text
    • http://napamewa.atwebpages.com/prova_auditor_fiscal_do_trabalho_2020_comentada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6567f5a3-3838-4032-929c-2b99b1cc5980/cost_of_living_index_world_cities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65968c7-27b6-4984-bb52-a1be00a2e362/5323150025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a9d57b-194c-4c59-9c20-be9c2a2c8c7e/67940833007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028cdf7e-04e9-4068-9e64-15146f4bc92f/olevia_tv_universal_remote_app.pdfIn PDF document text
    • https://mediapinki.blogspot.com/server6.php?asin=1598In 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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 5844 bytes
SHA-256: 95729287795cbfbbc0251bfdc1640728c10ae19a5d4300066db76fee20b3dfee
font_01_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 11712 bytes
SHA-256: 11f2fea16c106bae413dd936dfd3f226238b9e369fc700a5fa7d0c39741cd2e2