Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5546d20ed0c4cc…

MALICIOUS

PDF

97.8 KB Created: 2021-03-09 04:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c8b6fd8bcbdf2ce80afa096d166696d SHA-1: 916ac9d6d910f9e7e180a088891292393bc838cf SHA-256: bf5546d20ed0c4cc0bf8f62370019bc3067b035bd6423b01e1b9d58f84fac9c6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=bticino+living+international+catalogo+pdf PDF link annotation
    • http://figejewumoposes.getenjoyment.net/colloquial_arabic_levantine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_604642e9d866a.pdfIn PDF document text
    • http://kindraretterath.com/learn_python_3_the_hard_way_4th_edition8vy6x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_6029eef1c2c48.pdfIn PDF document text
    • http://trynutra.shop/powemujedibutili13ql.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/29073221166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_601e40736ba4a.pdfIn PDF document text
    • http://vitrinachel.ru/wie_man_ppige_Gelee_Seife_macht0xuwa.pdfIn PDF document text
    • http://ayazshabutdinov.club/yamaha_rx-v679_service_manualc55fn.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/clasificacion_de_la_lactancia_materna_segun_oms_unicef.pdfIn PDF document text
    • http://wirelessinfo.ru/jefegamodepewozasiron4mv32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_d8f7767ae96949199df80a64ad1ec4cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0d16bc-ea4d-4e19-abcb-11dbed0e13d7/48547225962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b0064d-836f-4aae-91ba-41e302b7e592/dosevudupadog.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_89b456c26ea24303babeea586664c206.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5501d8-6af8-4a21-9ebb-a0b9e491dced/73968664872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b409eab-0436-4840-b91e-0beeaed561fe/introduction_to_management_science_hillier_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5457c315-ad20-4868-bba3-acc0ad981e08/73461693422.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_faab0204ed9146bfb3687954b8b4951d.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_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 5252 bytes
SHA-256: dc764343263cf634ffb2d39f92ca6e6f6cf4cf34d29ff677915a6f9b22b09966
font_01_sfnt_off000147af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AF 16452 bytes
SHA-256: 0287d9dae9977c7faeebcb6976640b352bae3476daeb230daa798a8c7b02dd0c

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