Malicious PDF — malware analysis report

Static analysis result for SHA-256 760320b1ccb9a94c…

MALICIOUS

PDF

80.4 KB Created: 2021-04-13 06:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d1973391b97f6aac2dcfd250aba5d897 SHA-1: b1c0245728317663041cfe1f7e32a5facb475a43 SHA-256: 760320b1ccb9a94c29394502334d0bb7c0843371309b2b0f4f4e0a12bb47d6d7
186 Risk Score

Malware Insights

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

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 0.9992

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://mezovuduw.ru/strik?utm_term=best+portable+carpet+steam+cleaner+2020 PDF link annotation
    • https://cdn.sqhk.co/fogizotufijo/dqUjc7V/fefuzezisageronogax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495409/normal_6003c02b78e58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5fe062dd4c6de.pdfIn PDF document text
    • https://luboguti.weebly.com/uploads/1/3/0/7/130739177/7403459.pdfIn PDF document text
    • https://lekorasosin.weebly.com/uploads/1/3/4/6/134612915/dukiluzamolugonagon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_6038c9335b037.pdfIn PDF document text
    • http://megopoveguvujal.medianewsonline.com/purpose_driven_life_dvd_study_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_6017c0e5ded24.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/gadojuxijolirodu.pdfIn PDF document text
    • https://jalizirut.weebly.com/uploads/1/3/5/3/135308553/liwimesifovir.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/what_is_network_and_types_of_network.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/33620190425.pdfIn PDF document text
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/rokivigesoxinov.pdfIn PDF document text
    • https://cdn.sqhk.co/jujifefa/Xjahjij/kokopidelowijemevoxuvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9662d6de-704b-4c94-8d86-7100933ff50e/aprendiendo_un_curso_de_milagros_leccion_142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787140d3-da18-4d85-b24f-3e6b27efd38f/microsoft_word_table_of_contents_formatting.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_f3e7f9af3a8e4b748cf78d44fbd4151b.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_14f619101b5f436d84f33bbd2059fe57.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_365a46cb19404b4092c38395fe340d01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcac029-af52-487c-a64e-63168de652af/metasokekolatuwebesubiput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0038d639-4f8b-4312-81cc-ffe449c10c86/safotawuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c19510f-607d-434e-90bf-dcab71313c33/sokekomasezefifi.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/padumux.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_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 5544 bytes
SHA-256: d7fec04eb59231719d338be645232ba6aaa39781c3cdb8b3eebcd09453ff4872
font_01_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 11384 bytes
SHA-256: 7fc9fce20cc0d44a7f00b1cc8d127fc1c2ee0b5d2c71f5ec2e9aa983e28bd698