Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bf6649762d5df3…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 11:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f825b9a8758b5aabe18c20295a82585b SHA-1: afd92a9277928e4eb40ca7656606eaa449047f08 SHA-256: 50bf6649762d5df3b5cb41eb54e31228d18ccea796da8b966c417b4deb4d9b22
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV specifically detecting it as Pdf.Phishing.Trojan. The presence of an embedded URL pointing to 'chcial.ru' suggests a phishing attempt to redirect users to a malicious site. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URL indicate a likely phishing or malicious content delivery vector.

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://chcial.ru/pbw?utm_term=warhammer+40k+imperial+fists+codex+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416144/normal_6006e911bd8c3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4475729/normal_60aff2a7724a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_6048977f09d39.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408002/normal_60b6ba48d10ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484115/normal_5ffabeb6ca5fd.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/topamokoxed.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/5995473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_6057cc25bc9e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad7c162-e2ed-4f4b-9edd-ed331edcf078/all_over_but_the_shoutin_chapter_5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b003d696-5ee9-4129-ae20-6134fbefe54c/words_that_rhyme_with_moon_in_a_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc4a4aa-432f-4e1c-bc98-30194b2a344c/how_to_adjust_g_shock_g-7900.pdfIn PDF document text
    • http://vomuseteweto.pbworks.com/f/11246326314.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/w/file/fetch/144845193/programa_para_recuperar_fotos_apagadas_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1218d9e2-9ee4-40ec-a028-3799c1c18bae/are_slam_fire_shotguns_illegal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336a394d-9cc1-4444-b25f-50a77c56b9e4/linq_to_sql_tutorial_w3schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c540a8-33d1-45f1-8fc3-e2a853b02427/the_hunger_games_movie_download_in_tamil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 5772 bytes
SHA-256: 31cace4075044888f91de65e4d605bf32fe9602abf1b6e59ff1329bbd256f8d8
font_01_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 10868 bytes
SHA-256: d1797d60614066e5e29cc5a51b2d0d16bf2882c7a1599c636096418b17d1a288

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