Malicious PDF — malware analysis report

Static analysis result for SHA-256 0337ab2bc12f471b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-25 09:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: decac724e72fb30c3fdb1496971220b6 SHA-1: 861b16a594d5abbd766fdc01e4ae727ce13ec36c SHA-256: 0337ab2bc12f471bf18b687191af4597cadb19bce7f4c725b380d08368c353ea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a link farm. This suggests a phishing or SEO manipulation tactic, aiming to redirect users to potentially malicious or deceptive websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://dafemum.ru/strik?utm_term=asus+xonar+dgx+5.1+vs+creative+sound+blaster+audigy+fx PDF link annotation
    • http://smotrikino.fun/803862185345xtbc.pdfIn PDF document text
    • http://otomail.business/23669721719l3c9z.pdfIn PDF document text
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/jugadirugi_finosexe.pdfIn PDF document text
    • http://vepekideku.iblogger.org/verbe_etre_et_avoir_au_pass_compos_exercices.pdfIn PDF document text
    • https://sarisakela.weebly.com/uploads/1/3/5/3/135308925/vopus.pdfIn PDF document text
    • http://shtancircul.site/ford_dealership_near_me_service_hourskx4ts.pdfIn PDF document text
    • https://tulijibukabez.weebly.com/uploads/1/3/0/8/130814483/2837085.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/609685.pdfIn PDF document text
    • http://tumbochka.space/sevowawevedimutolobamakumb9vd.pdfIn PDF document text
    • http://davifil.iblogger.org/30043642198.pdfIn PDF document text
    • http://differencecheats.net/how_to_correct_citizen_eco_drive_watchak4sf.pdfIn PDF document text
    • http://daxogupifixago.iblogger.org/25484248845.pdfIn PDF document text
    • https://somokowu.weebly.com/uploads/1/3/1/3/131383604/vudasuzonoziparumam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_212e5921322e45608a21d4985c79e9e2.pdf?index=trueIn PDF document text
    • http://rutuber.rf.gd/balisep.pdfIn PDF document text
    • http://gagipuriligeme.rf.gd/coulomb_s_law_conceptual_worksheet_key.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_ec0424831c094b55b47db4e197d123e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/026bc174-d476-4164-99da-432a6aaaa284/14994723452.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_9a41bdda96844f32a324e7d6aad986f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c2a643-a229-4bee-b1e9-1ca2a07c1e11/texas_instruments_ti-84_plus_ce-t_python_edition_games.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_b94605d06d4c4c27959fa17ba3b4c56e.pdf?index=trueIn PDF document text
    • http://sexexunila.epizy.com/schler_bafg_formblatt_3_ausfllen.pdfIn PDF document text
    • http://kanisal.epizy.com/best_beginners_guide_to_stock_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b50c23-d862-4fc1-9224-4ad01f3aab4b/phases_of_the_moon_identification_worksheet.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_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 5756 bytes
SHA-256: 10774752b8f6d551b35dbac9d8c5ac9de4db04eb59515e071b24e848fdcceae6
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 10988 bytes
SHA-256: 25987bd13523a8169416b866e7db653ec3dd8a65bfbb4b62acffad2bb06231e5