Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff961e4d94e9360c…

MALICIOUS

PDF

102.1 KB Created: 2021-03-14 17:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0aa1dc959fbf347814d1403a4cb3e173 SHA-1: b4a4762094ea23501e43082b55950dea69d14067 SHA-256: ff961e4d94e9360c5c13dea5eccb4038ae676049f83b6bfe111ea415e081dd0c
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed for SEO manipulation. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to distribute malware or lead users to malicious sites. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=manual+de+sanacion+jin+shin+jyutsu+pdf PDF link annotation
    • http://uose.xyz/how_to_change_code_schlage_sense2mjaq.pdfIn PDF document text
    • http://useraisins.pro/julim0gci0.pdfIn PDF document text
    • http://yildirimotobursa.com/review_buku_the_magic_rhonda_byrnexj08l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490250/normal_60258c70e1aab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_6022d7b9a755b.pdfIn PDF document text
    • http://brightshopbg.xyz/ms_project_tutorial_free_downloaddlxan.pdfIn PDF document text
    • https://cdn.sqhk.co/bibikodazit/cBhighZ/zefasifa.pdfIn PDF document text
    • http://cmb-accueil.com/63962964775cod5a.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/NoL26jd/duplicity_definition_sentence.pdfIn PDF document text
    • http://samyog.ru/bluford_booksdcv3p.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/i7lckhh/rejaxinegagutuferor.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/Pjdgivf/vukedutigipamufemegotetuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491933/normal_5ff5e4a974b5d.pdfIn PDF document text
    • https://sowubibuf.weebly.com/uploads/1/3/4/3/134308786/f7c8a9ff55bd.pdfIn PDF document text
    • https://vowawekalumuz.weebly.com/uploads/1/3/5/3/135304311/1667085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/veledabejufi/wow_warlock_leveling_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/24860667492.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/asian_paints_products_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D0 5212 bytes
SHA-256: a71459ca0654a1f543a4af59b02709af1ce33f404e126316efbb0025b6ff3ce7
font_01_sfnt_off00015695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15695 11644 bytes
SHA-256: 4769e295e5db3dd959d618e37c1b40dc9d92fcbf1394c657c2003df4be61665b
font_02_sfnt_off00017c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C68 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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