Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d8b06555424f43…

MALICIOUS

PDF

85.0 KB Created: 2021-06-10 17:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6af7a53ddf1f7874673a79cfc4bb6e6c SHA-1: 410787b42ff0702a896b2599b15c69ad0d6663eb SHA-256: 24d8b06555424f434a04907c3426fad38138e3b8ec4e5490c4637c2a2230a3d4
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 0.9990

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=madea%2527s+big+happy+family+full+movie+free+123movies PDF link annotation
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/gadukito-jopufop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_602fb9d39e605.pdfIn PDF document text
    • https://gupimarozak.weebly.com/uploads/1/3/4/3/134350981/5822663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_60198644295ae.pdfIn PDF document text
    • https://mixutexevegov.weebly.com/uploads/1/3/4/7/134706804/3a33840b7be.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/viwevupokidaxeguv.pdfIn PDF document text
    • https://dubasebajulux.weebly.com/uploads/1/3/1/3/131382081/4676626.pdfIn PDF document text
    • https://sikalejewop.weebly.com/uploads/1/3/5/3/135341852/9386541.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421341/normal_60b3c53e0e201.pdfIn PDF document text
    • https://keduwamiboru.weebly.com/uploads/1/3/4/6/134669925/nopebu-duwamani-fixeresowiwuvu.pdfIn PDF document text
    • https://ginufadep.weebly.com/uploads/1/3/4/6/134668932/varusa_subelaga.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4456686/normal_60b78fcd1c8c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465250/normal_5ff32d967a693.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5fe4e2f5d3170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_604d1be5b4cea.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/2eeb154a-0659-44ee-bb5e-3e8a9ab97384/site_planning_and_design_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab0faeb-a232-4dd1-961c-a29cb780a1c6/51153006464.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/how_to_fatten_up_a_cow_for_slaughter.pdfIn PDF document text
    • http://zegakodas.pbworks.com/w/file/fetch/144659313/how_much_does_it_cost_to_service_a_ford_mondeo.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144474096/39629580877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95411f65-055a-4f11-bb52-b13ec2920ac4/loz_ocarina_of_time_fire_temple_walkthrough.pdfIn PDF document text
    • http://mopevot.pbworks.com/f/vomiting_pumpkin_template.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/f/bebeklerde_travma_riski_hemirelik_bakm_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee29885c-43d3-4194-8f4f-663de171d991/how_to_reset_armitron_sports_watch.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_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 5840 bytes
SHA-256: c0a05c31a2fe462445c3418820d6d2fc5d3c3649030247afb4f30778acd49018
font_01_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 10776 bytes
SHA-256: eeb6fed5d561a6d226d025510c9614cbf625519a755f54b875e2b75469d43183
font_02_sfnt_off000137be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e