Malicious PDF — malware analysis report

Static analysis result for SHA-256 c204af83241c2421…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 15:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6574dddb711d4ac0a01284b31e1fea8e SHA-1: 24f1931768315553fd8a06043b7e329de4c05d87 SHA-256: c204af83241c2421c299f52a2b363a5a486316959aae7d8fa935365a686e904f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized PDF documents, indicating a link farm strategy. One of the primary URLs, https://jacksth.ru/strik, is flagged as unknown reputation and is likely the intended destination for malicious activity. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=egalitarian+vs+hierarchical+pay+structure PDF link annotation
    • http://nubupexajed.iblogger.org/why_was_street_art_created.pdfIn PDF document text
    • http://stikc.xyz/tutesujozujupifatalkm6.pdfIn PDF document text
    • http://theandyhong.com/wugezogudivinut88eca.pdfIn PDF document text
    • http://mif-smeh.space/90127256102guzhd.pdfIn PDF document text
    • http://sadovik.me/71394501750omw6v.pdfIn PDF document text
    • http://pro-komp-master.website/ho_adivasi_dj_songs8z89.pdfIn PDF document text
    • http://czecheducation.space/kefagezowi0caqd.pdfIn PDF document text
    • http://opt15.ru/2000_buick_century_repair_manualfgx7k.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://s3.amazonaws.com/zijivevip/is_cyberpunk_2077_related_to_cyberpunk_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/spanish_numbers_1-100_printable_flash_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/ib_chemistry_oxford_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/catering_business_plan_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda76d82-2fb4-4b2c-a663-759d40e327eb/70757957178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58bec97-fb15-4cf8-a101-6b2125545ced/tusopofibevino.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_9a804374bf124a85874b8c195ac5e900.pdf?index=trueIn PDF document text
    • http://nolapejaselijak.epizy.com/fezazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014c943c-2d10-402c-b3c8-bd55e4d14719/vixuwupaluvomiber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2dc59f-ea6c-492b-9663-e7cb4c7b477a/59255277016.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/way_back_home_piano_sheet_hard.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_91ffe3262a1747758e1d23d0a6dd7167.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_b2a93ffea6d543e18e26e7b3a387d747.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_3b114979b2a246169fa72698cc8e420c.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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 5088 bytes
SHA-256: 0f6d29879cc6e3836415d501a7f63278b383b51161128803d45ab902ca1cc255
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10556 bytes
SHA-256: c2f89ea370d52425d75972dc8c50688ea167b437b9ef08821574224a5fc1ab9e
font_02_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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