Malicious PDF — malware analysis report

Static analysis result for SHA-256 702af1b26b3cfdb8…

MALICIOUS

PDF

89.3 KB Created: 2021-05-17 17:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 297bb761ffe5f255bc3da4280237401d SHA-1: bbeb49cc654a4cc5dacac32fc23aae1207ca1302 SHA-256: 702af1b26b3cfdb8513fb58cfb186f395d7b044fc4042e673a77f44a6ecd3b52
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=how+to+use+watercolor+procreate PDF link annotation
    • https://cdn.sqhk.co/popaxutu/Fqxjj5R/90897335613.pdfIn PDF document text
    • https://cdn.sqhk.co/xosaletozobi/jjlocgh/bahubali_film_songs_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/jLhahcw/race_king_trailers.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/manosuza.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ibickGN/51647134481.pdfIn PDF document text
    • https://busirapamuxojap.weebly.com/uploads/1/3/1/6/131606670/dabutif-pulotozovipog.pdfIn PDF document text
    • https://lufigukinuma.weebly.com/uploads/1/3/2/6/132680864/9893700.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/PnbRjfy/counter_strike_global_offensive_update_patch.pdfIn PDF document text
    • https://cdn.sqhk.co/denugesugumu/diezxig/adobe_reader_for_pc_software.pdfIn PDF document text
    • https://pajodiwid.weebly.com/uploads/1/3/0/9/130968992/5430314.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://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_b8a6bb784d7a4c9686dba89c17a5e08c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/potamotaz/5539060635.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_dd53df3d8cfb48dd962abc31eb9ec2b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/character_map_tamil_software_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 4708 bytes
SHA-256: e07bbd31c34b3b0f35a4e8c74ab570e0a16df67d10714786908abaf4a607e30a
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 11356 bytes
SHA-256: 41cc5a31fb48878449823f226a914538e0ed259dbb8d4419cd15aa7663c5b7cd
font_03_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
font_04_sfnt_off00014784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14784 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333