Malicious PDF — malware analysis report

Static analysis result for SHA-256 e483cf4cb7449db0…

MALICIOUS

PDF

103.5 KB Created: 2021-05-07 01:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 168dfef6e02d8c3f09883f8a9de8f5a3 SHA-1: b0035818a59ea8285363d74c5c9cb1b82c5daeda SHA-256: e483cf4cb7449db084cc6a0fdbca9f9d7b926ff6d3b1fbe04e7310e19df65e66
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, including a suspicious URL at "gimoguvi.ru". The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=southern+ireland+postcode+format PDF link annotation
    • https://retezuve.weebly.com/uploads/1/3/2/7/132741149/larejumurodum_vemibezafoz_molexoletimutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fff6de78d758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_606a6bbb48e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_604cf18fbf64a.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/minizinejon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_6029e85e71d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_602c161252b79.pdfIn PDF document text
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/13cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_6056f66d8cd47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_600e09492c81b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_600d5796bee5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/subagugatexonavepo.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_22d870d666b04fedaa95eb57c3b491f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/feed_the_beast_ultimate_reloaded_guide.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_35f6b81d79404292b1c90a66878c94b1.pdf?index=trueIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_c5072b34198548ad8c70165f98941cef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/7494303306.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_fa6cc0e0c7e04b749e83c47241b78a9a.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_725309123b9a41079a1377ad5c17ac84.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_f8d5e687b8ec4f208ed5099446e48e5e.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_760106fdafdb4afeb621b526bd720c0b.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_e6b61a856ea047758704f487150c17e3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CC 5500 bytes
SHA-256: bd4809f2d105e2a91aa4b51f589c803d1a9f8919a2b7e1580d28aa0ca7c40b39
font_01_sfnt_off00016853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16853 12340 bytes
SHA-256: 9d50dc791118fbf0e8a12ca60cfa67904550f0590c15c193649325ab8e284d80