Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fea7bff4b991bd4…

MALICIOUS

PDF

78.3 KB Created: 2021-03-19 01:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2a0dbdda2a4bbef41462d9f5682cb41 SHA-1: 200cc1322c9b446c1f464f7ab27ed6e30905981f SHA-256: 1fea7bff4b991bd45b6a6c22b53f669741e8646dcf3a2a98c8a2042f0acb8afe
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the document's nature as a link farm on disposable hosting, reinforcing the attack pattern.

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://mezovuduw.ru/award?keyword=palmistry+book+pdf PDF link annotation
    • http://wumiwuzigimo.mywebcommunity.org/how_to_write_letter_of_recommendation_for_internship.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fcd1c92aed10.pdfIn PDF document text
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/6186489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5fe74f8a6c6b4.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/lodufiraf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5fe5499072da2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fed579dec465.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/fizexerexuxi.pdfIn PDF document text
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/1550337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_6000e6ad12109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_605091130649e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_60274b6a3fe6d.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/muruboramuvuv_nuzevuvelofanof_buvalelojujen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_60257f63a338a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_5fe8cbaba9a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_603ff43eda3f7.pdfIn PDF document text
    • https://dagaroxir.weebly.com/uploads/1/3/5/9/135973008/360011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fe00e84315e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakasis.onlinewebshop.net/zepaziwokupaxewa.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_c64ccd7c33374d3cbd42f4683ba954f8.pdf?index=trueIn PDF document text
    • http://zudupaxub.myartsonline.com/where_to_buy_wahl.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_cf7f757d1412495fb8b5cdd497166dd3.pdf?index=trueIn PDF document text
    • http://gafodix.myartsonline.com/support_vector_machine_example.pdfIn 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_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 5492 bytes
SHA-256: 6a2a262ddb9612ca25967014d72e3820e06618b4743d470f2c6d6a9edff69370
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 11108 bytes
SHA-256: e0b04e41d087561174391c225b55e2c0a857334f86b30b327a6ee3ba006a4a13

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