Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e1c3cc24d9cec5…

MALICIOUS

PDF

77.7 KB Created: 2021-03-05 10:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a1e5fceb0695f15df130c55841696f6d SHA-1: d422a93e7a4843f1da8f671bc713846e51113092 SHA-256: 53e1c3cc24d9cec5f8f73a44f546cef82864caac1be3d0ea3436e43674bc9fa2
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one directly linked to a suspicious domain ('pelibifir.ru') and flagged as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://pelibifir.ru/aws?utm_term=why+should+you+not+tumble+dry+some+clothes PDF link annotation
    • https://cdn.sqhk.co/jagibuvat/djgjajf/popirodegimedawodibedimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_603890f2915f9.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/gehdjhT/94518677174.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/UBiiWju/tumobilul.pdfIn PDF document text
    • http://drawer.icu/writer_in_the_dark_piano_sheete9hfh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368978/normal_5ffc21d505e79.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/hgiifgh/kezigimebadag.pdfIn PDF document text
    • http://reduslim-ufficiale.website/56964309378t0n6s.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/Lgfmjjl/custom_cast_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5fe8d841705a6.pdfIn PDF document text
    • http://tiktoktop.design/daluvelakelerisawerha416.pdfIn PDF document text
    • http://rewita.fun/how_to_use_craftsman_125_psi_air_compressorrc184.pdfIn PDF document text
    • http://mybiol.site/14373145106hbnjq.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/bahghb7/coffin_dance_meme_gif_with_sound.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/jbihjbe/fun_facts_about_mercury_on_the_periodic_table.pdfIn PDF document text
    • https://cdn.sqhk.co/suxidixip/3gdhtjb/dr._driving_mod.pdfIn PDF document text
    • http://bukudix.getenjoyment.net/zutifelu.pdfIn PDF document text
    • http://golixudib.mypressonline.com/muzabufokevugasetireriku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaxomuterok.epizy.com/54818920624.pdfIn PDF document text
    • http://gilupusaxuzamo.epizy.com/segolopudulafadim.pdfIn PDF document text
    • http://tuxusar.epizy.com/insert_blank_page_in_file.pdfIn PDF document text
    • http://netojukab.rf.gd/63874608540.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_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 5224 bytes
SHA-256: 2d44fe339335fdfd0a045b32b6a08bb10ea10499c099877081de1786db6924f7
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 11252 bytes
SHA-256: 78894b694f7b04e4a3ebd3836e1e859b052e66d836fabc9228540a17b2a4fcd7

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