Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f4a40b38c6bc6f…

MALICIOUS

PDF

77.6 KB Created: 2021-03-16 05:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1898a4db84d83a79b4f2cc97de9536fa SHA-1: 4eff6e236ad401839dc48e42932fc5aa297c08bf SHA-256: 28f4a40b38c6bc6fc635ab59456e9df003f30d3fd178d386662059ac5cdd0879
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable hosting and exhibiting characteristics of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/123?utm_term=cdc+flu+facts+sheet PDF link annotation
    • http://milanomoda-italy.site/vovepae8e8b.pdfIn PDF document text
    • http://1cats.space/group_video_conference_free_appn5lr4.pdfIn PDF document text
    • https://piteselijofer.weebly.com/uploads/1/3/4/6/134608400/xozelegobibara_fuzas.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/4282852.pdfIn PDF document text
    • http://bafutazipavev.iblogger.org/alimentacion_saludable_minsa.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/AwCgcic/sixugubugefoleviz.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/Fkjgegf/syfy_original_movies_shark.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/zorivabakizilaziwaza.pdfIn PDF document text
    • http://opt15.ru/zomikipegopuzdqk2j.pdfIn PDF document text
    • http://itawegan.space/jumukidajilakerunufulj10g2.pdfIn PDF document text
    • https://gexurowi.weebly.com/uploads/1/3/4/5/134529019/7424447.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/lagakiluvejaxo_semudufoke.pdfIn PDF document text
    • http://remontnatali.ru/how_to_display_data_from_database_in_html_table_using_ajax6zb87.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/a0bb3c21-17fb-43f4-a764-a51641d4ad58/vupufufagekasiwaredew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1506218-98ed-4a2d-b8b9-ee19a303749c/le_petit_prince_french.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_574b37de1f8a4ddbbf36919368bc82b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/968efddb-fd07-49fc-99a3-82c240928369/the_over_40_hormone_reset_diet_main_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84453a57-6c47-4b3a-a474-879a409d26ae/what_does_preparing_automatic_repair.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_7a3c106843e44bce84d0ae7b34a66ade.pdf?index=trueIn PDF document text
    • http://darokajiwebag.rf.gd/dukozuvezikutila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8956d18d-4355-477d-93ad-4431d267b134/unication_g5_antenna.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_2bf32ab88dd045b8ae2c5edaf8d2fa4e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 4652 bytes
SHA-256: 6273412a1c9c23f7d1124c2d454c760a7713eae6e4cf0e0c36d9ecd2d97cb4df
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 10384 bytes
SHA-256: 70c5ab0eb905bc4e78d5f9f32a7408eb073c63df4a1b0d81f9a6bf50d3bbea56
font_02_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3