Malicious PDF — malware analysis report

Static analysis result for SHA-256 634508a751688ba9…

MALICIOUS

PDF

80.2 KB Created: 2021-03-25 17:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ab61d3be0fc19542887584fc845c4f65 SHA-1: 251232edf3d08aa781013a793b7fc2f68a67599c SHA-256: 634508a751688ba9ecdceb64c12bc0c97a6e28905857df0cd865eaf7eac0c8d4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. The document body, though heavily obfuscated, appears to be a lure related to 'ejercicios de notacion cientifica'. The presence of external URIs and the link farm heuristic strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=ejercicios+de+notacion+cientifica+1+bachillerato+pdf PDF link annotation
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/1956662.pdfIn PDF document text
    • http://instapodarok.site/pokemon_sun_and_moon_rom_download_fomqj3d.pdfIn PDF document text
    • http://bossyonlinex.com/wekefedofopeligova5o5tw.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/h8ZeWge/lapazisudag.pdfIn PDF document text
    • http://italonewsero.site/2012_chevy_impala_transmission_for_salek01ad.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/artritis_aguda_y_cronica.pdfIn PDF document text
    • http://effektzhizni.ru/diet_evolution_free_downloadk3wo9.pdfIn PDF document text
    • http://tryadasert.online/96019168031iwq6p.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/ijihtgj/guninagasu.pdfIn PDF document text
    • http://norasuzajo.mywebcommunity.org/catch_me_if_you_can_book_chapter_1_summary.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/simemozeriwuduxenu.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/ipc_a_610g_acceptability_of_electronic_assemblies.pdfIn PDF document text
    • http://shmelev.pro/fazutoxuzegojko3bs.pdfIn PDF document text
    • http://metalllift.ru/formatos_para_analisis_y_descripcion_de_puestos_de_trabajog19lk.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/gazijewevan/wetivulozilune.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/79806067302.pdfIn PDF document text
    • http://xevijojikutep.onlinewebshop.net/34433478410.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_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 5256 bytes
SHA-256: c83e16b30dd77dbff274576af7d49ebdd32e39fbfe1b0b90eb07b1af68fbf32a
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 11840 bytes
SHA-256: 7695cdabde2d99a7e059315c88c20a418831aeef52bc19148ce3a705c6d7d65a
font_02_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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