Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ff5e131c494591…

MALICIOUS

PDF

72.2 KB Created: 2021-04-22 05:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1750041adc873135ecd15696849d2a08 SHA-1: 211922e35e4ec9d6256241b4ab63c75fdbfa5ca7 SHA-256: b1ff5e131c494591e6920bc5dfb8b71ab3e91cf545101523b0098796df99d3c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary one redirecting to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to appliance installation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=how+to+install+bosch+dishwasher+side+clips PDF link annotation
    • http://mifvideo.space/giwogudabutolimunux5qq11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366304/normal_6005754e3af2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5ff8b71182484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5fd91ef88b8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_6068b1f4b6537.pdfIn PDF document text
    • http://formverifiedbadge.com/8241936057534yvu.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/8Agcgjq/90288559180.pdfIn PDF document text
    • http://studyweb.site/dubai_health_authority_corona_test_resultwmtcn.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418987/normal_5ff8b0793b26e.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/jhxggjx/dining_table_set_with_bench_cheap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_6025097fb6c9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_605c4460e75c4.pdfIn PDF document text
    • https://cdn.sqhk.co/dokamaruxif/cidhi5J/zebaro.pdfIn PDF document text
    • https://cdn.sqhk.co/zesuxetirano/egc4gdW/minecraft_achievement_guide_1._13.pdfIn PDF document text
    • http://shoop-fh.ru/rhythm_exercises_for_beginners58bgt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_6056030c7afaa.pdfIn PDF document text
    • https://cdn.sqhk.co/kujaruwajovi/dmkhgHj/movie_empire_tycoon_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5fd7ef0686080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_5fd7eafd47e6b.pdfIn PDF document text
    • http://maslovauto.ru/easy_native_american_flute_sheet_musro21l.pdfIn PDF document text
    • https://cdn.sqhk.co/ropulufira/jj82lMg/beautiful_naat_sharif_ringtone_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 5356 bytes
SHA-256: 34e61cb97838adaaabe0a4f5a1b8e0e9ed2a123aa60c921d4ad726e06dbeff2b
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10844 bytes
SHA-256: 60e4f1d9ba03577a674453b9a3fe24655be4436b7cb17c27a7f01e096c1afe23

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