Malicious PDF — malware analysis report

Static analysis result for SHA-256 edafd7ec6ef26f16…

MALICIOUS

PDF

75.8 KB Created: 2021-05-23 22:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ca7650ebadf923106f62d2a1056c7eb SHA-1: 857c55badcbdb39990cbad03d240caf947ad1cd6 SHA-256: edafd7ec6ef26f1614a8fff03ad58c12f567646a1a6372fda4785545f939cee6
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 0.9997

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://vilenefex.ru/strik?utm_term=free+product+key+for+windows+10+pro PDF link annotation
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/salikoroxoxis-wiviw-dipanuxunum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_60253a1f821a4.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/fikaxubet_vizoxesotadojo_bonuvizaruw_razafaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_602c6375db374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371497/normal_5fe1c67d425e8.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/dikenegiwano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fe79729ae293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462379/normal_5fc7650a3afc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403543/normal_5fe513a2bfd7b.pdfIn PDF document text
    • https://zuwanefo.weebly.com/uploads/1/3/4/0/134040462/puvokubixumiga.pdfIn PDF document text
    • https://sorezoxawo.weebly.com/uploads/1/3/2/7/132712551/toreb-gogubuked-milamiwa-zugopideribekow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fdc4bec70baf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_605b795b152c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_6015628c5ebc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_60664f81711e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_602a4694129fb.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/gadojetexazobop_wutejivipemibir_lufulurepufeze.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/165a4289-f133-4d33-b16c-cc5577c2d761/major_themes_in_house_on_mango_street.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ec39ec-40d4-423b-8f15-9b4c3cc554e5/66593196010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c20c309-ad3d-4dcb-91ed-94af90229ab4/dramatic_irony_in_romeo_and_juliet_act_1_scene_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd1854e-64e2-4889-a904-4e318b6b9d66/reset_my_service_engine_soon_light_nissan.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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 5312 bytes
SHA-256: 4ac8b7cbd9597f64a6a947dcb6acce460ca3394019780517ccb0c371607f41ed
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 10616 bytes
SHA-256: bbec56a505cbc948f72c7e0a64b98fa87b539bc6eb09e3966666d815971addf0