Malicious PDF — malware analysis report

Static analysis result for SHA-256 5753cedd9d8cca05…

MALICIOUS

PDF

76.9 KB Created: 2021-05-13 09:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9b1e817c3c37cf2e665884d66c5200f SHA-1: 98f85125b45b5e6196f4e98d1015f0cc9127710a SHA-256: 5753cedd9d8cca05f4461c2ce5d512f0dd23ee6a6250d50b629de70fc11468e4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, with the primary URL being `https://zajinet.ru/strik?utm_term=fundamentals+of+plant+pathology+book+pdf`. This suggests the document is designed to direct users to a link farm or phishing site, likely to distribute further malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=fundamentals+of+plant+pathology+book+pdf
    • http://4kuhd.me/pocket_icuqzbet.pdf
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/2171236.pdf
    • http://reduslimitaly-official.site/55027802162s61kb.pdf
    • http://easterthjg.com/dutizumikinakrlmq.pdf
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/damupalepoja.pdf
    • http://nubuxeki.scienceontheweb.net/78121543914.pdf
    • http://hook-up.fun/mozafatepad32dq5.pdf
    • https://relitemora.weebly.com/uploads/1/3/4/3/134352419/sileluzudev_boributatatonuw_xemanedek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_3b8210e6e601408cabe9aadde5ab2d9a.pdf?index=true
    • http://tivakifuzir.atwebpages.com/netinubomupiguposikomos.pdf
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_8b8f95fa3a3b41428626f9cb2e9f94b6.pdf?index=true
    • https://s3.amazonaws.com/wamatasamegu/vuxutitak.pdf
    • http://gagonunanu.epizy.com/house_chores_worksheets.pdf
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_ca9193617a1e4500965d296d6608e6e6.pdf?index=true
    • http://xuwolerapole.epizy.com/xodarifubanefenivupome.pdf
    • http://xizirali.epizy.com/how_to_use_self_timer_on_nikon_d3400.pdf
    • https://s3.amazonaws.com/purufiz/bootcamp_for_macbook_air_2010.pdf
    • http://ropigitapeda.rf.gd/97446755482.pdf
    • http://vodobugatusexa.epizy.com/cadmatic_4._1_manual.pdf
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_ad4211f5584c4f84b993a3dc6e216026.pdf?index=true
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_c413456b9d184f31aec372e54575c8a6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee03.bin
05483f88af6f532c07056043e63d023a74429061bfd17d9462963c3220959e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 5620 bytes
font_01_sfnt_off00010107.bin
84dd0d098b7e0ce13526deb8e8e8976d2167f659771ca70f3c3977b69bbad7c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 10672 bytes

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