Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb6ec93defb2a9e…

MALICIOUS

PDF

74.3 KB Created: 2021-05-21 12:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 116bc53bf0788d974e82035d072a9435 SHA-1: 23d8c6742e22700fc88b114458b22146a62aba68 SHA-256: 8fb6ec93defb2a9eef728a35b37d1d795414b9bb5045caf6aea452d88865269e
214 Risk Score

Malware Insights

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

The PDF contains embedded links to malicious redirector infrastructure and a large number of external PDF links, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=sudoku+solver+3x3+step+by+step In PDF document text
    • https://sogutujugaj.weebly.com/uploads/1/3/4/4/134403955/tojumo.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/2676696.pdfIn PDF document text
    • https://tuxiwuke.weebly.com/uploads/1/3/4/6/134611110/7428004.pdfIn PDF document text
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/0645f3.pdfIn PDF document text
    • https://bolefapazudakaj.weebly.com/uploads/1/3/4/4/134478960/xofuzikizul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/13ba6ae3-a4f1-4482-bcd7-2a658b4b80ac/standard_subject_identification_code_usmc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25154f26-8940-40c4-bd68-77557d33a013/susovenaligibirunega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0b4f15-50d0-47e1-8bed-e5032a4de1f3/57101666044.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/dazagimejapaxigaxasati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5102fd9e-6116-4c09-b94c-2d21f9cebf3f/vukagexexadadidifeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2bddd6-a610-4506-aadd-61f13a9f81dc/73165062661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba63e67e-6da2-434e-89a2-a2ea833df3ea/75228420742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325e5202-e0a5-4700-9142-f44c3043a920/minecraft_redstone_handbook_updated_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c20729d-9277-42ba-b492-ba959c05cc51/wogaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c47079e-4f9a-41f3-8514-4c3623df4130/continuidad_de_los_parques_analisis_titulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb72b16c-0049-47c2-84cf-2841ca856fcd/how_to_pray_istikhara_step_by_step_islamqa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d345daac-20c0-430b-9014-3d79c9e05e5a/bissell_little_green_proheat_pet_portable_carpet__upholstery_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b773235-938d-43aa-8161-24c623ff3580/pretty_little_liars_theme_song_british.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/expediting_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/tuwilabosulonifemejasev.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/jovixukebiwab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 5172 bytes
SHA-256: 1b3aa0f595c1b0f7a40e4a529a6646463326b0b16a113b1ebded817e0b1fe9a2
font_01_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 11172 bytes
SHA-256: ca13be1eee5a88bc1474ee02b4f649fe031aa1148e1f2c5defdcd01073816a16
font_02_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2