Malicious PDF — malware analysis report

Static analysis result for SHA-256 36134946a64c4851…

MALICIOUS

PDF

79.7 KB Created: 2021-06-08 19:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 359e16505139a4263ef2db0a06ecec62 SHA-1: 51c78de6f4cabc4e01ff051e240f4ba15a35404a SHA-256: 36134946a64c4851cc634affc49bc99aba983813741103f602d12dc180b1d388
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'persuasive essay example pdf', likely a lure to encourage clicks on the embedded URLs.

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://ketchas.ru/pbw?utm_term=persuasive+essay+example+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369311/normal_601380a474dfe.pdfIn PDF document text
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/faxonibix_difemoguv_fovox_penadozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_602ac11d91d1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_601ee527e37cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492892/normal_6002bc2935b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_603c5857884ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403404/normal_5fdf93186b6e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5fddf62a580cb.pdfIn PDF document text
    • https://jefamiwufilidiv.weebly.com/uploads/1/3/1/4/131409158/davukasiradet_wobobiroza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5fcf5e5ad3324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_6035786abea5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_604e791baea14.pdfIn PDF document text
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/735920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_604f2657ba6a1.pdfIn PDF document text
    • https://senugosuka.weebly.com/uploads/1/3/1/4/131454109/bevilebivifa_xejij_fesopesomemuj_sisezokebura.pdfIn PDF document text
    • https://juxeduwabup.weebly.com/uploads/1/3/0/7/130775558/wiladolubab-wagatexe-bukotob.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/9c187964-cb3b-42ba-b3ee-bab373c6eecf/oldest_living_cast_member_of_gone_with_the_wind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1306547-3952-4a29-95d9-b392cd492c88/how_to_draw_what_you_see_in_your_mind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0648abc-4d61-4f57-952e-ca7a314b8fa6/who_is_lady_antebellums_husband.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3fa638-1717-4c1c-84a0-7bbdd1c6912a/how_long_is_the_pge_power_outage_going_to_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8042100-54c0-43e2-b642-de00e1220a93/fundamental_accounting_principles_23rd_edition_mcgraw-hill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd77768c-727a-45d1-8570-1f7811344eb6/28871624091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d0c9f6-c809-4683-a687-a2ee311a4e97/sagifafinobexiluxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2354a6d-ee49-4368-b9c1-99e1584a55c5/canon_powershot_a1200_hd_precio.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_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 5416 bytes
SHA-256: e973cf6e9e4a25f2ea0b9f4961f03eaf21684d53494168dccdcfa4d3c08385b7
font_01_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 10672 bytes
SHA-256: a56ea1b2cb4b27d8f05759481d632ee9e7f1216868aa651c43475c0d4d8848be