Malicious PDF — malware analysis report

Static analysis result for SHA-256 3774339bea2d2f65…

MALICIOUS

PDF

91.3 KB Created: 2021-03-14 21:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f81fd37a391a17ad7392a21c76a32eba SHA-1: ab69a81310e3f026f6f7beac11088e434c3bb1a3 SHA-256: 3774339bea2d2f659ba00d260d653b8b0ff28c68afc174efe8a59712c13566ed
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=bade+bhai+sahab+story+pdf PDF link annotation
    • https://nomiviweran.weebly.com/uploads/1/3/1/0/131070579/1747859f1b01.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/jolesurutilaluvogete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410717/normal_5fd69ca3255ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461211/normal_60038730b2d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_6038324c85e56.pdfIn PDF document text
    • https://vusutiti.weebly.com/uploads/1/3/4/7/134762674/1652929f03fa51.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/05f730cb5.pdfIn PDF document text
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/rukedom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5fdbc2a2da0d2.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/60a2038e-8bef-4b0f-9aa1-831bc38c26f5/besoliripisadaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bb96b3-3d2f-4140-9129-9f9779306844/9543210193.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/4546855614.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/lowudorese.pdfIn PDF document text
    • http://suxaxisanu.rf.gd/argus_4_thermal_imaging_camera_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c8b4fa-3010-4ed9-8f11-55b976716f00/12182972088.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/vefuzamuwavoravokeraras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008115a3-74db-433e-9027-7994c19c18c7/shadow_and_bone_book_1_read_online.pdfIn PDF document text
    • http://zexukojol.rf.gd/evaluation_sheet_for_school_project.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b53112-36d7-4405-b1ff-4c5f7ba273eb/89317848766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46734fbf-ed3d-45d3-baf5-010a01f18039/82310553768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ac7f56-1e60-4138-b371-90ba3f8ecf36/is_walmart_still_open_24_hours_a_day.pdfIn PDF document text
    • http://musarozopod.rf.gd/nepubabirewasuwumazemiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb93887-c4b7-448f-8f4d-8707b83c7a40/how_to_get_quiz_answers_on_canvas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa155db-db6d-4284-b125-80416157c6ba/basununusexaj.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_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 5388 bytes
SHA-256: 406ff179d1ed195cf418e2935ca12f45cea55502350e3c08e90866052ae6745a
font_01_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 10392 bytes
SHA-256: 409743d682697f839396893ed71731344f0502a40b662678277c565282b5b01a