Malicious PDF — malware analysis report

Static analysis result for SHA-256 3590847f4964da4c…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 07:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f7998f4777737953cd41d74f94596f99 SHA-1: 056189c10d07f6db8e626923b41ff71f594e4de2 SHA-256: 3590847f4964da4c4e16549c5a6f0c5ee7e969e6cfab21df87fc18b6b8e636ca
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to download or visit a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=manual+screen+printing+machine+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483346/normal_5fe6f7210bf0b.pdfIn PDF document text
    • https://nasupatuvijel.weebly.com/uploads/1/3/4/6/134610874/1828568.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/EoGgiZ5/happy_and_fun_pop_background_music_free_download.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/gokiwazewozerikog.pdfIn PDF document text
    • https://cdn.sqhk.co/sapekuzob/f43jihf/av_malformation_mri_brain.pdfIn PDF document text
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/bilenugi-tiluguximiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392463/normal_6053294836108.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/jihijie/world_cricket_battle_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/hiI9Lhe/seven_deadly_sins_grand_cross_jp_facebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_6045fe22e8c64.pdfIn PDF document text
    • https://kozugirufeji.weebly.com/uploads/1/3/4/8/134884007/laxunut_kolebijakev_vuwavevij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fe5510bd25d0.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/82b35f34-bc7b-4a07-a823-12e8ac48e3c7/xudaxibunixuwu.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_d7a0348e050c41a291d955539bedb174.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_609d52aa04a5412a8b99b2d39d0db7f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/496cb09f-be37-49ad-810b-860bf3a8992f/bible_trivia_questions_and_answers_king_james_version.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_9583b4a841584dd7b9c51e0cb1b7b2e5.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_06a9fb7d5d5c4aa48c1d3fdb00995c24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/faed5e13-8917-4fcb-b592-4ff47a463356/vipasutivitefisagejeka.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_74b8d090278441cca2b518af75ebaff6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/475e517a-dea0-42b2-b2cc-c30ea29b049e/dokegozire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58eec483-0a7c-4531-b889-209a80d1d1e3/79312064270.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_e5fc37f7afed409e83c2ac5a851455de.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_f24184db97aa43ed8016100132dd64d2.pdf?index=trueIn 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_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5436 bytes
SHA-256: c588f36c5546a3d036504a4aabd563b81b4d962084987338b0d1dbb7029bf6f2
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 10556 bytes
SHA-256: 5a9d5af52908814a7c3a46ced5382af16fe54ff6ca2c66a3cebb1402d1716738