Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ac28785c18da86…

MALICIOUS

PDF

76.0 KB Created: 2021-05-27 12:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e3462123274907631a9a8e261b45050b SHA-1: 7101986a67266cced527bc9e9b4985eed814c5ae SHA-256: c0ac28785c18da86916db38f3c8f182a55192e5faa6151ee365076d27fafde70
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 0.9991

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://ponafet.ru/strik?utm_term=how+to+factory+reset+acer+laptop+with+windows+7 PDF link annotation
    • https://purolakesis.weebly.com/uploads/1/3/4/5/134588460/3720020.pdfIn PDF document text
    • https://pepajodik.weebly.com/uploads/1/3/1/4/131453945/kamaz.pdfIn PDF document text
    • https://lozagazol.weebly.com/uploads/1/3/4/2/134266804/847cd.pdfIn PDF document text
    • https://radenomubadinor.weebly.com/uploads/1/3/4/1/134108668/josazupokademifeko.pdfIn PDF document text
    • https://giminefimir.weebly.com/uploads/1/3/0/9/130969553/rakese.pdfIn PDF document text
    • https://nadepopuzoli.weebly.com/uploads/1/3/4/6/134611029/5439e66.pdfIn PDF document text
    • https://fevegukiso.weebly.com/uploads/1/3/1/4/131482975/kuset.pdfIn PDF document text
    • https://jejojoroliwe.weebly.com/uploads/1/3/4/3/134310913/zunezutojajik_ponofi.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/b174a176-5eb6-47b0-bf19-be72be9079e8/conexant_audio_driver_windows_10_hp_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2463f0-8587-4f66-b3f7-0fdb904ef88e/tejoporisowodomodapubuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99214801-0db1-4048-986b-bec6c5f5af91/govotowunisekadigudek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd68599e-424e-417e-a42f-3e2b3ca20521/the_vampire_diaries_video_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5abf0e5e-fe23-49c9-9be8-77169fe8fdf1/tissot_1853_price_in_kenya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658ae47b-a32d-4405-9e6d-79821ea9271a/miniature_dachshund_puppies_for_sale_near_me_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9709debe-ac10-429a-a6b4-fdfd28744419/how_do_i_reset_my_tracfone_voicemail_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed04cec-1f64-4077-b01c-418fe053029f/how_the_grinch_stole_christmas_story_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a400b7-fa06-4c08-a2eb-dabeb35e918b/tikewugunagufekikapadoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07f9535-9bb7-49be-a1e6-c08f1288485e/fifty_shades_of_grey_free_movie_download_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2577eda0-3e9d-4ae4-89ad-bca3ac1854a7/septa_r5_schedule_weekend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b7ff92-1d6c-40b7-91ec-323c1b65810f/does_the_outsider_have_a_sequel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdcfbc12-afce-49e0-b127-b124b75abec7/1395134854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876c107a-0e3f-4f08-9421-d8811e298bf2/67117147028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7cfc7fc-b870-47de-8bba-abad5c97bdbd/nike_logo_brand_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663394a1-9350-4e92-bcca-03c4eaeba744/gabemariwama.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_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 5480 bytes
SHA-256: dc2b2fe0300e73c99a08fc1dada528fd08667e4d5b192f4b46646529119e94c3
font_01_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 10280 bytes
SHA-256: 16db63fe0752e2072d3b837850c508bee69a43d0b8f2f18ddec34a13a6e7684a