Malicious PDF — malware analysis report

Static analysis result for SHA-256 773012f44467ce8e…

MALICIOUS

PDF

80.5 KB Created: 2021-06-11 11:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8fc859da835447fe561c791e3e63f347 SHA-1: 0436401b5db19dedc28d86833f10f1c0f21d93f2 SHA-256: 773012f44467ce8eb5e278badde7e2913d444bcb63d293ff6bf33bc75417b3ee
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious sites. The primary malicious URL identified is https://laborke.ru/pbw?utm_term=did+i+slip+a+disc+in+my+back.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/pbw?utm_term=did+i+slip+a+disc+in+my+back PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4369626/normal_60aff483b3b23.pdfIn PDF document text
    • https://xisaluzesa.weebly.com/uploads/1/3/4/6/134602292/fuzilowidufexufuko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5fcd37d208711.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/956105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144780957/72291741299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0aeb49-4dec-4182-85c5-3ef728abf60c/torubobevuladujeva.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144685653/9138134629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d27fe57-1b5b-48c1-aab8-7c9fa0a9b201/polidumugan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe0f331-633a-447e-bfab-987669f445f5/81222089343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3151477a-180c-4f6b-873f-797b2e2d6212/air_transportation_a_management_perspective.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee3fddc-48f6-48e6-adce-54390310d2fb/t_fal_safe_2_pressure_cooker_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9ac7d7-d6aa-4183-a4e2-97d34160ebc5/46828004734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a3face-1b4f-4db7-a016-bfd9e3130f40/70689173686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ddc2499-b942-4455-a422-12efe10f2bed/98677403939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea749680-88a2-4b1e-9d59-ba72d534c446/disney_plus_login_verizon.pdfIn PDF document text
    • http://bavudexote.pbworks.com/w/file/fetch/144675645/sizuzesofebaserimol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8af1b8-5726-4335-8ec2-2203655c7389/what_is_the_order_of_marvel_movies_chronologically.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a568250a-3d19-4efc-abbe-3f2e4e8beeda/ti-84_plus_ce_graphing_calculator_battery.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_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 5428 bytes
SHA-256: d31541f7a82b2e52fa4cb785d22c8eaa2c75648bf9a332ce3dc1c4c4693cc736
font_01_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 9920 bytes
SHA-256: 1b10f31be394f9ea709aa9d5e71116026be4fb940fa971fd2d6d3d862e4d73b1