Malicious PDF — malware analysis report

Static analysis result for SHA-256 280b5431e2f79b38…

MALICIOUS

PDF

80.4 KB Created: 2021-03-22 22:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: df71559f6e5f67e44fce2e9c0bb591a4 SHA-1: c5d1e51b550953c65ed422e33133ce0cf6ca3fa1 SHA-256: 280b5431e2f79b38ab541d25753a2dca42b716cef09d30ccfab6ae90df987d01
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, specifically using a link that promises a free book to entice users. The presence of a malformed stream length and ML classification strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://resalured.ru/strik?utm_term=dork+diaries+9+full+book+online+free PDF link annotation
    • https://wisufisuzok.weebly.com/uploads/1/3/1/3/131383924/b6242497d40f42.pdfIn PDF document text
    • http://opensalle.xyz/how_to_call_dish_tvw8vpo.pdfIn PDF document text
    • http://idealicacolumbia.site/70997430359227x5.pdfIn PDF document text
    • https://mapobosani.weebly.com/uploads/1/3/4/3/134385232/lefezitinopubufa.pdfIn PDF document text
    • http://zahlungsservice-ch.site/boiler_water_standardspsatc.pdfIn PDF document text
    • http://stickerrus.ru/90895203459m2l39.pdfIn PDF document text
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/bagufeziwoduku_bilogu.pdfIn PDF document text
    • https://warenumew.weebly.com/uploads/1/3/4/8/134871813/sivexixapog-deril.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/wojalisopi.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/77e23555-9867-4818-8a20-98db94eaec08/xitotezug.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/laxuriv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955256db-e97b-429e-b20b-06b9b821ac57/84272856497.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/79120505966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9528fd-8856-4209-890e-468acb94eb60/which_is_the_best_bosch_integrated_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/dotujimekuxozikilevewoxav.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_d0c0709a7aad48bd94ca24cf358fb0bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/latufenaw/mainpuri_ki_mata_sheetla_maharani.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/how_to_start_career_in_android_development.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_b4469bff2bcf4e1ebd7058d374321dd1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48bbb1f7-8764-4a54-b981-356eeb7a64f5/best_small_engine_repair_book.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_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 5260 bytes
SHA-256: 92d0cdb0ac08cc2ff187b7f066d9aabf027350f068a7219d13b266d1a470dc77
font_01_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 10756 bytes
SHA-256: 9b99a50162cdac292a8b9892602de2249278b853091e13a99f9617f5eddb3999

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