Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4059fac2a50729…

MALICIOUS

PDF

81.3 KB Created: 2021-03-17 07:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c218ae9f8eda7d5e730c7a0a66621f3 SHA-1: 5a067a167f2b69c65ce6b1de9927a4ce928260b6 SHA-256: fb4059fac2a5072937d6acb598b673180015e00f75d41adb1db6b3d544967704
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 0.9997

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://pelibifir.ru/strik?utm_term=apple+time+capsule+setup+bridge+mode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410975/normal_5fea08baad2da.pdfIn PDF document text
    • https://tuzakalo.weebly.com/uploads/1/3/4/4/134492431/6bd44b80ee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5ff456642d102.pdfIn PDF document text
    • https://bevikutemo.weebly.com/uploads/1/3/4/6/134648684/9221f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_600e4196be394.pdfIn PDF document text
    • https://pazaduzot.weebly.com/uploads/1/3/4/4/134473777/542703.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/powutufunilasune.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/b148b035-e9ce-4277-a1c7-4d47ec83b2b5/62716028479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24006614-4748-4857-8899-267723e7c334/40356016697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b261746-d94d-44a9-b760-d7bc87180c09/30659065066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a509c4-312c-4109-9d9c-05225fd59ace/what_is_the_quietest_9000_watt_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff48aaa-6dec-482d-9561-efec80658ca2/guns_germs_and_steel_movie_questions.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_0a45353db1154199999482f32eed31c9.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_1929c646212c4b69b86d9f32867c71ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazofi/wrinkle_in_time_imdb_parents_guide.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_70b1a5d081bb4c29a4c45f6eb489451d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/636da379-4947-4361-b10a-c60355004164/60127849930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305013c0-52f1-4a7c-950e-072e4b0c7a8e/how_to_replace_an_outlet_with_a_usb_outlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7800e0b-1b8b-46b8-be98-5ce62caa6199/canon_mg3520_ink_cartridges.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_07e72bd615fd4eec9daa6e74775ec5ba.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_b74b4e2cf064486c8d40bc13b27921fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/brownian_motion_equation.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_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 5524 bytes
SHA-256: 92ce43d4a0c409326a9c33de26510767c30ea9549c9324360b2783ca5a53e87b
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 11040 bytes
SHA-256: 25e715358b1c075f1a30b7379dd0ec6a2bd7abb6fdbaedd4f2de3e8e24fbcced