Malicious PDF — malware analysis report

Static analysis result for SHA-256 5362e1f7286f99dc…

MALICIOUS

PDF

79.1 KB Created: 2021-03-27 17:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 241c4e23a49cffa0fef92f5b98fcafe8 SHA-1: a7cc954b478e09355bbcc3420cc3aef7a2652e32 SHA-256: 5362e1f7286f99dc260a0d193303ca57c19d7cb3333eedd0371411869be22770
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. This suggests the document is designed to manipulate search engine results or redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=paper+cutting+art+tutorial+pdf PDF link annotation
    • https://bosevexoliwi.weebly.com/uploads/1/3/4/5/134585498/e494f4735d1d.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/mgiNUia/22_hammer_nailer.pdfIn PDF document text
    • https://cdn.sqhk.co/xobabowiwa/cPDIe0O/rayman_jungle_run_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5fd644cd5837e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_605b7949d41e5.pdfIn PDF document text
    • https://zodukoweferu.weebly.com/uploads/1/3/1/0/131069906/weralim_novamesoza_ximonamo.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/fBieAje/31176363509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_605533b637fa9.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/8208434.pdfIn PDF document text
    • http://tipijijajofupi.sportsontheweb.net/10311171540.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/3121521209.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/idhiblC/vaxanikul.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/6718979.pdfIn PDF document text
    • https://zomudefe.weebly.com/uploads/1/3/0/7/130740133/ganilovizure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zikeko/what_the_bible_says_about_christmas.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/82846065746.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/59795795819.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_7cdbf28dba2f4c92bc97358d69bad44a.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_39c302573b2a4f008b911e46cdebe609.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_aa534c2b3fc24dcda2a9d11ef66c1ee9.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_e237118822bf45b4af6c913fa7ae6553.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_9bbb37a4ba2e43038a237dc0f43e7ca9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebenok/modelo_de_memorandum_de_llamada_de_atencion_por_incumplimiento.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_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 5148 bytes
SHA-256: d3ab9e040f158212b080d4de17573674eb40d295508f8905012486d1043c44b9
font_01_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 11100 bytes
SHA-256: 94ea4fe3cf6426b86fda686d2ebf9c6e47bda96968605f4b49195dcfee644cf0