Malicious PDF — malware analysis report

Static analysis result for SHA-256 849cd201b0a33097…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 16:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d90b163d8bd42f7b5fce63505501c59d SHA-1: 5f93247c9c607dff178c47abfa4bd5cb3f47eb60 SHA-256: 849cd201b0a33097eec586abb133bbb7ff3f3f54652e9af9e87ae633d57c8043
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominent URL leading to a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=how+to+perform+autolytic+debridement
    • http://bivitajuteje.mypressonline.com/65489755660.pdf
    • http://dororuminaxa.mywebcommunity.org/gatineau_park_winter_trail_map.pdf
    • https://static.s123-cdn-static.com/uploads/4484636/normal_5ff33e12708bb.pdf
    • https://cdn.sqhk.co/wixexozesila/RHgdgjR/vanesobuk.pdf
    • https://cdn.sqhk.co/pisomuma/hjhjghd/idle_dungeon_village_tycoon_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4410448/normal_60148675f114f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pisik/xumofaf.pdf
    • https://s3.amazonaws.com/robumuduluwise/salario_promedio_en_mexico_2020_inegi.pdf
    • https://s3.amazonaws.com/ropidadegaxut/aspire_cf_vv_battery_not_charging.pdf
    • https://s3.amazonaws.com/rujimidujek/76647163091.pdf
    • https://uploads.strikinglycdn.com/files/c5c19306-be1e-4d6a-bf38-1edd45817c24/lederetuwobone.pdf
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_f411841dafed435693b1b1217eb66d13.pdf?index=true
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_d5d7ce1024e04a28b435fc3a6d2ad980.pdf?index=true
    • https://s3.amazonaws.com/sulasatevirexo/73337535596.pdf
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_7b10db5df8ca472295aa418381a76e51.pdf?index=true
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_2f6dc2d499944d4cba0b5bd3e839f293.pdf?index=true
    • https://uploads.strikinglycdn.com/files/67ba6eca-6851-45ae-bf39-f1354eb5be34/63496932461.pdf
    • https://uploads.strikinglycdn.com/files/d6b9cdb8-4933-4406-b58f-971a6f321aa0/70168248258.pdf
    • https://uploads.strikinglycdn.com/files/31b15742-1381-4c51-b1ef-deacbcac9e9b/fundamentals_of_pathology_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef39.bin
1e491d687d43686f3551fc0ae8415d264a621d8977304b5f15c4c408ec77090a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5416 bytes
font_01_sfnt_off0001019d.bin
0800ff25d1ad1f3084d0aaf391dff28224efe5f311d144cf09e280b4b2e2b392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 11164 bytes

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