Malicious PDF — malware analysis report

Static analysis result for SHA-256 155a921bb0bb49af…

MALICIOUS

PDF

59.4 KB Created: 2021-01-31 21:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c1a114a23da7d36660efe2ef4298135e SHA-1: 3ca17f6a7dbb07a864b92b16a4a7a0ae9d7ce020 SHA-256: 155a921bb0bb49af03589e10d6f64c5011c7eca0e536b36cbf923d8f28626773
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9728

Heuristics 4

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/aws?utm_term=lucid+dreams+sheet+music+free PDF link annotation
    • https://cdn.sqhk.co/datolabevev/aijgfsK/christmas_coloring_books_near_me.pdfIn PDF document text
    • https://tinuwese.weebly.com/uploads/1/3/5/3/135300683/nibafuvudalumexivasu.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/ihjcjak/princess_pixel_art_sandbox_color_by_number_drawings.pdfIn PDF document text
    • https://joxalazugadono.weebly.com/uploads/1/3/1/4/131437099/bizavubazowupomujozu.pdfIn PDF document text
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/a55aa5c.pdfIn PDF document text
    • http://mimawusavap.iblogger.org/gusotamujejisefajujoru.pdfIn PDF document text
    • https://cdn.sqhk.co/vixokezafafu/hcicgg6/ragdoll_achievement_1_hacked.pdfIn PDF document text
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/dozukexezupobit_xofif_kovapager_guvuvukux.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/pGjiAhc/memomimowalerededu.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/jnhajjI/bonimubaresujita.pdfIn PDF document text
    • http://zalofamanaw.22web.org/emergency_contact_cards_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukutud/88650179019.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/2015_toyota_camry_se_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/ender_s_game_dialectical_journal_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/75707133593.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/biblical_names_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/edhesive_answers_unit_2.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/pamefaguvika.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/brigandine_iso_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/cryptography_for_dummies_ebook_free.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 5172 bytes
SHA-256: cbe3d96483aa30f1dc3e4351cc596e9df8126283efada69c483d2792d3391382

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