Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd4064cf01aec6b…

MALICIOUS

PDF

80.4 KB Created: 2021-03-12 07:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3f69fd8a52494247b4d46e65a126c924 SHA-1: 21e401aec9c6c997916746b8e8ee10931769a1ba SHA-256: ddd4064cf01aec6b7c2a8de4962b572bcccf0d7011d16e9b789fc71d6525f2bd
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 flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=how+to++minecraft+mods+mac+2019 PDF link annotation
    • http://xeeewq.xyz/befeforop4lsm.pdfIn PDF document text
    • http://online-sistem.site/whats_wrong_with_purpose_driven_lifedy4oe.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/android_studio_shortcut.pdfIn PDF document text
    • http://betmoy56.com/895326542359w4x3.pdfIn PDF document text
    • http://alcexpress3.xyz/al_madina_book9l5h5.pdfIn PDF document text
    • http://momentshop.website/81683742244e3ehz.pdfIn PDF document text
    • http://tronreserve.online/bidebobinuvhx2k.pdfIn PDF document text
    • http://bitjoms.xyz/biochemistry_study_guide_answer_keyri9kw.pdfIn PDF document text
    • http://bridgecommerce.com/56988160718ulux9.pdfIn PDF document text
    • http://podjem2.club/sentence_fragment_worksheet_with_answers0h6tt.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/852048d2-e7f1-417e-a9be-4680c2db2b27/sedevalagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db097c0f-ff3e-4a69-9ed0-e76d1054c1e5/ley_de_ohm_ejercicios_resueltos_circuitos_en_serie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e9210a-b55d-42ee-8ad2-abc8709d567c/falcon_bms_4.32_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/someone_like_you_lyrics_rod_stewart_meaning.pdfIn PDF document text
    • http://rodaselawowov.rf.gd/photoshop_free_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/carcinosarcoma_uterino.pdfIn PDF document text
    • http://gawuvuv.epizy.com/visual_studio_code_change_python_formatter.pdfIn PDF document text
    • http://texokobatogu.epizy.com/plant_physiology_and_development_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5012d2ae-c6fc-460e-af1b-025c449ed77a/rojefowudoguf.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_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 5672 bytes
SHA-256: 3e9500b03aca0d1bc82cffd765a98e21ea076ea63aad46fe09385464827a48af
font_01_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 10684 bytes
SHA-256: af96556546c40c2a6b028ec8152892745d4a19f6d002adf3e0807538959dc1b8

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