Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca60550ab55fb60e…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 08:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a25289e4d71204e61dde3610e52c00bd SHA-1: eaa06c26c36c2fe9184e63fe24624cb67f20f788 SHA-256: ca60550ab55fb60edf32f2154b6bfb464f6bcc39b8c3fc4f5f49b3da95baadf1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to host many links, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=bemaleda+meyaz+book+1+pdf PDF link annotation
    • http://talezoruvaje.iblogger.org/16578250607.pdfIn PDF document text
    • http://rowozogano.22web.org/91395880052.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/e10831.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/68160082702.pdfIn PDF document text
    • http://takavejesutep.iblogger.org/nenobepizawowexamujera.pdfIn PDF document text
    • http://zazeteku.iblogger.org/insurance_comparison_spreadsheet_template.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/zujilofogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxozuzemonixe.epizy.com/video_bioskop_indonesia_terbaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1505e390-7d78-4405-86d7-88ba265d1d80/how_many_books_are_there_in_the_shade_of_vampire_series.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_3789ba283a5042668345ad1ea20859b2.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_b449672de8e248fb815633ce3a97721d.pdf?index=trueIn PDF document text
    • http://zejenideve.rf.gd/33129474964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce770f2-347a-4986-993e-8eb1c0ef6192/62883044719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8beb19c-5176-4125-aeda-018364f87965/skyworth_smart_tv_55_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53971db3-f5df-40b1-a230-b0d1a779b84b/maytag_bravos_washer_help.pdfIn PDF document text
    • http://tutivute.epizy.com/worship_songs_lyrics_free.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_3300960fda574616b205917f3addb34e.pdf?index=trueIn PDF document text
    • http://gunexukod.epizy.com/jobs_worksheets_for_1st_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2491d623-e5b6-48a9-98e5-86a59a67be28/44698054716.pdfIn PDF document text
    • http://lejemerane.epizy.com/xegajufojimavefege.pdfIn PDF document text
    • http://fomajunelafid.epizy.com/troy_bilt_tb240_honda_engine_spark_plug.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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 5368 bytes
SHA-256: dc13da9aaa9f54771f586f4ece0b3362a10e14dfb7f634eacd54951c37a7388c
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 12112 bytes
SHA-256: 99bd97189a1319e21fcee218e67760d3e662cb0a6e402db892cb75d34a64815c

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