Malicious PDF — malware analysis report

Static analysis result for SHA-256 87df218542fa5cad…

MALICIOUS

PDF

80.6 KB Created: 2021-04-08 03:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a0d477b85b7d6afaff28eea3b97b887c SHA-1: 70c8ee6d4e0869116b54aeb529ad310ca8aded26 SHA-256: 87df218542fa5cadb6693484aa3f83f13dd654cd78da7e4f80a6c282d94de7e8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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
  • 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://kuzutuzo.ru/strik?utm_term=how+to+fall+in+love+reddit PDF link annotation
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/vukixix-lamig-nexerimaroga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fcbc9decc650.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/6gihahc/bezolepodogokaka.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/HagAtjc/nodaxigo.pdfIn PDF document text
    • https://cdn.sqhk.co/zoraxiraga/gcicjj1/maa_brahmacharini_ki_photo.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/hfgge1r/riniki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_60262471d7475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_603f28781e628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393916/normal_5fe28bb357d99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368759/normal_5feb79982efe0.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/315e533668ab83c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5fd6e80b9045f.pdfIn PDF document text
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/6629438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_60291cdcafdb1.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/hfgddic/dagaxalofegirasalipakuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_6067e65b80df4.pdfIn PDF document text
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/cbc39a97843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://purowubiwebig.epizy.com/national_museum_bangkok_guided_tour.pdfIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_59fd47b6ad2e40cfb1724e56ca697c01.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_fdc1da0caa4d49f5b916d598e034c570.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_1ce26d27d8454720899b25db5997c3e7.pdf?index=trueIn PDF document text
    • http://xepalufozakot.epizy.com/fofamuvofisesakumuva.pdfIn PDF document text
    • http://xabogubumux.rf.gd/gordon_wood_the_radicalism_of_the_american_revolution.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_8f06830ced384a5381e10b8addd0d04b.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_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 4836 bytes
SHA-256: 5c96ec5eafb6fb47ac20383e6a7341f9d4aa84be29bfefe9a0a3d91d69c43eb4
font_01_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 11444 bytes
SHA-256: e62df2fbe910e2756bf41616ec8055f34d8f6ddf981b7eb41b25edfcce2d2b39

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