Malicious PDF — malware analysis report

Static analysis result for SHA-256 51843ea9a448aad7…

MALICIOUS

PDF

73.7 KB Created: 2021-06-10 18:39:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 369e6ff58cd8329586631a5dcc196077 SHA-1: 693ebf540dbd3d6a2a60ab261e23ce9ade3ec1d3 SHA-256: 51843ea9a448aad7582e2be65ea89a3e3eff40fbef377c865b0af2e1fe8676b0
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/pbw?utm_term=watch+les+miserables+2020+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450340/normal_5fd650b82c14f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_606c7478dfe25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_6016d842324a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_604f8194b3d60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejojixi.pbworks.com/f/passive_voice_past_continuous_tense_exercises.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/mifiwedekisamavilepiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8155e676-ec04-4206-b48c-eccddba95b3b/latibivimosixadekot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b58899-76a0-4c15-8c12-c0ab3e79c27c/software_qa_salary_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fe946a-6116-41e3-a02a-eaffeab826e3/zodaxazumaruwogelupuw.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/f/68536930986.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/advantages_of_non_probability_sampling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6820e7-2954-4b5e-8056-be571827efe5/zisisotokasibapak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1a4465-5740-405b-add6-ed0429723505/manual_pedaleira_digitech_rp90_portugues.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/56334400998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59872c9-0269-46af-ba2c-a24d8a61a527/nimoxelonejoxapobedewujor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e351ad-1d72-46f0-a873-8f4dcc6099d8/97084563773.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144501543/what_happened_to_brunos_father_at_the_end.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/w/file/fetch/144514845/jj_keller_tractor_trailer_driver_training_manual_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a2508d-d31b-4d3b-8d1d-b4fcdf961676/psalm_23_1-5_niv.pdfIn PDF document text
    • http://zufumegi.pbworks.com/w/file/fetch/144422691/how_long_do_you_cook_frozen_lasagna_in_a_convection_oven.pdfIn PDF document text
    • http://bolejagum.pbworks.com/w/file/fetch/144815547/98523781862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f9d9ee-3230-4d49-a22e-19b5f94c4e98/where_can_i_get_a_free_thanksgiving_dinner_delivered.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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 5548 bytes
SHA-256: e550e68575e50af2940490f92c439a7c8240c5ac987261db8b34107c816acfc9
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 11208 bytes
SHA-256: 3d3d6904d5337e1f604818d48f0d8df5d6f994320569b4b2a059c1f2c5c6b9af