Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8643b83585fbbc…

MALICIOUS

PDF

69.8 KB Created: 2021-05-20 14:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 05696c5992f5f6b1a3685b596b2494b2 SHA-1: 751d193bddd80f541a4a633fdc1c09c2a96a85e2 SHA-256: 4b8643b83585fbbc88d0687ab851e4dac3b4f8a9c1cc9ef4a5fdbd3a572b7cbc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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 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.
  • 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=free+download+software+spss+16.0+full+version PDF link annotation
    • https://kasuvimifimo.weebly.com/uploads/1/3/1/6/131637099/bilufuj.pdfIn PDF document text
    • https://voxesisa.weebly.com/uploads/1/3/4/3/134349259/luwugisabatikejixope.pdfIn PDF document text
    • https://keduwamiboru.weebly.com/uploads/1/3/4/6/134669925/tewutijudom.pdfIn PDF document text
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/bizumado.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/e428f7c8-8003-41f7-aced-b5c27307d6f6/71977082367.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/darotozoval.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/the_story_of_channon_rose_free_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/19703328319.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/5953363378.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/timex_nature_sounds_clock_radio_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/94913218107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6444e6-a522-4b83-aff2-8eb33497fdcb/hpi_baja_5b_parts_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/46994030255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1776e446-c0c6-4624-8222-8956c30c85f6/7406698113.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/narixuvejilibufadetisedib.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/best_london_travel_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/combustion_science_and_technology_latex_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d9a56b-4b1a-44fc-8fc2-0c001eba8402/jufexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d968c08-88b8-4afd-b715-632455b50734/40750371189.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/oxford_picture_dictionary_english-_korean_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/nutivumumedobulap.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/rareluraparojodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a289ef5b-b8d8-4998-b5bd-035ddfe409a4/what_is_fox_news_doing_now.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_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 5520 bytes
SHA-256: 9a624301910713a2d7bcac3c2429e826f9ff09105fe7140fd5b4d3033ff09d35
font_01_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 10640 bytes
SHA-256: 3df7b4ab4e9b514826e86a8ed840b58d03a6a1a0f62a4c495580537a5e4ecc20

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