Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1b5ab64a1ec61e…

MALICIOUS

PDF

97.9 KB Created: 2021-05-06 04:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bd310710b3ed883953af8c450ccee757 SHA-1: de55c9001bcda60ad3a61f5d31bccdcbd746a90e SHA-256: da1b5ab64a1ec61eb2c79d93a5fcf3646090128ade2e2f9df4e166346bedacbb
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to deliver a second-stage payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=thus+spoke+zarathustra+part+1+summary PDF link annotation
    • http://tiwilofojifig.sportsontheweb.net/logitech_x-530_5.1_speaker_system.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ff82d6e0aed1.pdfIn PDF document text
    • http://javefuxola.getenjoyment.net/another_other_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/yghhcwk/worefarogali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fd999159c401.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/41226411507.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/hXhdsii/wormax._io_2_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475582/normal_5fdd89c4a36ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_60260ccc5b7e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_605b05be647ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467032/normal_600d910e0d5b7.pdfIn PDF document text
    • https://cdn.sqhk.co/meparifemoji/hfzjgSN/68769910439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465277/normal_605d65ad89713.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486353/normal_600618006da82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_600b7a4d3a4f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379500/normal_5fdd952751487.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepetixapokurob.myartsonline.com/19384211057.pdfIn PDF document text
    • http://jonesojawu.myartsonline.com/a_song_of_ice_and_fire_hardcover_box_set.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/lisosuviri.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/minimalist_logo_quiz_answers.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/tekonsha_prodigy_manual.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_off00013fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD9 5244 bytes
SHA-256: f45bbc4d1941671bec231214e00de0a403a80e7100b30b55d8125b39f88506de
font_01_sfnt_off00015198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15198 11996 bytes
SHA-256: 13c196a3588fef638a3be9e4d0b6ca3a122e7025d137a916e9a82d31bb98df43

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