Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd251fd18b9222a7…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 00:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9b4965120019e844847f62f7dcad2fa4 SHA-1: b0178239801704970765fc4eb0124bcc4448de21 SHA-256: fd251fd18b9222a7615fbaf5eca4911daee2b784bad3d121a91539d2f4d4c93b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of them pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+long+do+cosco+car+seats+last PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458150/normal_603f3e6cbcf11.pdfIn PDF document text
    • http://sendgrid-de.com/how_to_read_aggregate_report_in_jmetern77y7.pdfIn PDF document text
    • http://zuzitijimopa.22web.org/tony_little_gazelle_freestyle_reviews.pdfIn PDF document text
    • http://app-3null.com/4978763834vhx8n.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/hdbjhib/today_s_fishing_forecast_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5fdfa92ee7ded.pdfIn PDF document text
    • http://winclean-shop.space/manual_de_estructuras_ilustradozr49w.pdfIn PDF document text
    • http://regse.website/44068850960cuiyf.pdfIn PDF document text
    • http://flipping-car.online/zotuzasuvibuxurawiwirgl.pdfIn PDF document text
    • https://cdn.sqhk.co/pujalabasi/jigcNhd/64507583824.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://s3.amazonaws.com/fomudebipefasu/spotify_premium_apk_2019_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a1d9ea-4ded-4114-9f28-2301c6988f8d/26929198822.pdfIn PDF document text
    • http://nupituf.epizy.com/97341660065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dc8307-0f8d-4caa-b8ed-005a18c376f7/761672133.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/vadogiwexofutufosini.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/where_is_the_battery_for_a_2012_dodge_avenger.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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 4900 bytes
SHA-256: acd179a04d693bb63e432c36b806c0e550ecde537d79017a3cf1c13ac5db61f8
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 10864 bytes
SHA-256: 445f6b2d57351f53978b18e6154043ca9c90acf6a6ba9b600198a5aaefa831fe
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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