Malicious PDF — malware analysis report

Static analysis result for SHA-256 08434e77515542d1…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 09:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5736fcae08ba63f0bf8ee112fbbf0898 SHA-1: 90bc712c862f092f6eb021a68d6386f2ca2b24f6 SHA-256: 08434e77515542d1d2b5a5768c335968720b80e2981b9a3913c1aca7797bce5f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though partially garbled, suggests a lure related to 'timeline of administration'. The presence of numerous external URIs, including one pointing to 'resalured.ru', indicates an attempt to redirect the user to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users via links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=linea+del+tiempo+de+la+administracion+en+el+siglo+xxi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465263/normal_6053c09e087a4.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/posanusubofosasetorozax.pdfIn PDF document text
    • http://buloshnaya.site/959988499589i25.pdfIn PDF document text
    • https://wovuxekas.weebly.com/uploads/1/3/4/3/134379471/2420640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_6000b83af0b4c.pdfIn PDF document text
    • http://fbcopyright-center.com/81724112150zp9cc.pdfIn PDF document text
    • http://agentsoft.space/88705862587c2u5i.pdfIn PDF document text
    • http://burrrhey.tech/konica_minolta_bizhub_c558_user_manualeuu0e.pdfIn PDF document text
    • http://oneitshop.info/magna_seating_excelsior_springs_mo_64024mbdl8.pdfIn PDF document text
    • http://ig-objectionform.com/bulujowi2uwdu.pdfIn PDF document text
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/supigaleb-duseboj-zexux.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/shia_books_urdu_free_download.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/nasazozefifuviguzuwasebo.pdfIn PDF document text
    • http://baranaydin.org/654522301tb9ao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/laxutupepun.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/husqvarna_435_price.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/rojoviloberuwodivegisizu.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/free_predator_call_sounds_s.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_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 5404 bytes
SHA-256: ffbe72cc8dc4364d9878c0fabb40b3dd4c06a164c73f30ca12a1aa8de86a0175
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 11872 bytes
SHA-256: 89a728d060604124845d042eb1c1bca205bfd6a132ee10faa0ef4e86b0c3fc46

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