Malicious PDF — malware analysis report

Static analysis result for SHA-256 af441ca45bd6e2f4…

MALICIOUS

PDF

85.1 KB Created: 2021-04-05 08:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dc366a9098369e5d660f14c246a92f4f SHA-1: 10fdb3b50990413b27c34adffe1247d6a75dea6b SHA-256: af441ca45bd6e2f4ad10968a7ec38545463ef4e94badc280cd147f799727adb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9990

Heuristics 5

  • 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://maypoin.ru/123?utm_term=heavyweight+bhangra+remix+song PDF link annotation
    • http://podarokinsta24.online/mivaxufirixuprx6k0.pdfIn PDF document text
    • http://zubiki.top/15170331379iyzvs.pdfIn PDF document text
    • http://xikewimuvos.iblogger.org/trane_xb80_ignitor_replacement.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcb8eb99a765.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/kojuwifubokasarare.pdfIn PDF document text
    • https://duvedibis.weebly.com/uploads/1/3/4/1/134131600/ruguj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_6038734bf4164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_60543225e293e.pdfIn PDF document text
    • http://tifanagapi.22web.org/monitor_cardiaco_speedo_66002g0emnp1.pdfIn PDF document text
    • http://redita.fun/t_l_c_ki_full_formh5do2.pdfIn PDF document text
    • http://gatorama.space/z_score_table_2020dsqqa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_6032c1b6825f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_604a7a0fdc51e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_6060f8221a61a.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/miwivajapiramefozan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387924/normal_5ff329972249f.pdfIn PDF document text
    • http://storeplus.pro/answer_key_for_10th_english_2019ap5zp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_6027a6318f368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_cffbd7e52b61437286463a9c79ff3b43.pdf?index=trueIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_9681e463b1a8417bb6ea2197672d1d70.pdf?index=trueIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_949500c38e51427bad72dd023e1b1816.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_a7e23549390f491a9ab00301a9235b03.pdf?index=trueIn PDF document text
    • http://nikonujilo.epizy.com/overwatch_ashe_guide_deutsch.pdfIn PDF document text
    • http://jejivosijej.rf.gd/titinixojodet.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_30e58d85c7db4546998b1424f103cf51.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_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 5488 bytes
SHA-256: d5a8f70cb1b0732f1c2687488663edcead5cc252883884a11e525919d49efbe3
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 3984 bytes
SHA-256: ec26268e2901c1be443a4a98a5cd0a0f58f28724128d36c7bfecf472e4715234
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 11244 bytes
SHA-256: 7c7f4274fec15ea7d107a2a7ba16cb140f741d6a51a5910886211b44a1333f0a