Malicious PDF — malware analysis report

Static analysis result for SHA-256 4594600a8a4c07a8…

MALICIOUS

PDF

85.3 KB Created: 2021-05-01 01:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b1d2c319bf4dad86862003aa93a1fc9a SHA-1: c8705e551e4d3c0ae3f8e15de9130d5c6d659109 SHA-256: 4594600a8a4c07a87e96dd1c48595875f4862bc313da9571bfbaedd4f61caba4
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, indicative of a link farm or SEO spam campaign. The presence of a deceptive title related to weight loss suggests a phishing or malicious redirection attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely for distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=how+to+maintain+slim+body+after+delivery PDF link annotation
    • http://mebelintera.ru/47157768332jsnv0.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/jiYjeP6/wifi_analyzer_android_github.pdfIn PDF document text
    • http://molotkov.site/9604406974911nkb.pdfIn PDF document text
    • http://xuxisozolawub.22web.org/agregados_monetarios_definicion.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/iihQjif/solar_system_the_planets.pdfIn PDF document text
    • http://goods-amzon.com/honeywell_wifi_visionpro_8000_installation_guide77apt.pdfIn PDF document text
    • http://recepty-dd.info/hp_probook_4530s_specificationl1d83.pdfIn PDF document text
    • https://cdn.sqhk.co/wusosekame/ehaSjf4/67458681786.pdfIn PDF document text
    • http://goods-amzon.com/padigajiwikateesic0.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/0ggfQN1/miratorogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_e3cfe3e98fe14f56a1f1f0d025d272df.pdf?index=trueIn PDF document text
    • http://rigirulame.epizy.com/38102417392.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_e7ad20822e504f35abc91c748d092e38.pdf?index=trueIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/gakebusofevededo.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_d5307646cebb49eab3f42989f2f5393d.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_eafff88c96f04c26ab78e9f216fb6b9e.pdf?index=trueIn PDF document text
    • http://munekekenagixo.rf.gd/gedebif.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_1dbdc08048cb4ac9b2273b3ab4e69bdc.pdf?index=trueIn PDF document text
    • http://josetevuj.epizy.com/31183220384.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_de1081129a934b1daece47f841f60872.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_234bcb6c07fa413f9cf25d0efbc2bd81.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_8e0a47c175c7491ca22d0d67ae250b3f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 5196 bytes
SHA-256: b6b039d5b67180ca3ba263eaae19d17a5ac4164fa6aa9cf2dd29d217493bfed6
font_01_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 10576 bytes
SHA-256: a4eb946fa19c2a00f5e98dfde655aa8414e537297a285f31c56af22630afa95b
font_02_sfnt_off000137e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2