Malicious PDF — malware analysis report

Static analysis result for SHA-256 152dcca38043c26b…

MALICIOUS

PDF

65.6 KB Created: 2021-02-25 08:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 13fb38cc9515b08e174246a286108dc6 SHA-1: 8fcf1263e01939c7c6aa13a9fde5541143c6e2cf SHA-256: 152dcca38043c26b54c2a4da538878ca59dd62bb9bec4932224fb801063f63ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected by ML classifiers and ClamAV as a malicious PDF, specifically flagged as Pdf.Phishing.Trojan. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious websites. The PDF structure and embedded links indicate a likely phishing or malware distribution attempt, leveraging the document as an initial attack vector.

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://leonvi.ru/wix?keyword=samsung+scs-2u01+power+supply PDF link annotation
    • http://skameyki.club/xixogigug78cu.pdfIn PDF document text
    • https://vagipirisixo.weebly.com/uploads/1/3/4/8/134861957/rukepojiziw.pdfIn PDF document text
    • http://loveantravel.xyz/agile_project_management_tools_listu2xvq.pdfIn PDF document text
    • http://thailandlove.site/bareilly_ki_barfi_movie_filmywap_hdhzffg.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/reterolebi_lerufubek.pdfIn PDF document text
    • http://opendouche.xyz/meaning_of_dusk_till_dawn_curfew2sb8k.pdfIn PDF document text
    • http://jisubumutowegur.22web.org/carnatic_music_free_sites.pdfIn PDF document text
    • https://jasesinokez.weebly.com/uploads/1/3/1/1/131164090/dajaxugemenoz.pdfIn PDF document text
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/12f64a6385.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/cf2998e0eed3a1f.pdfIn PDF document text
    • http://5-euro.info/form_for_rbi_grade_b_201895cz2.pdfIn PDF document text
    • http://demask.space/52659715464lgndo.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/4145476.pdfIn PDF document text
    • http://detonic-buy.website/high_pointe_microwave_convection_oven_owners_manualhkma2.pdfIn PDF document text
    • https://xinuxarovota.weebly.com/uploads/1/3/0/7/130776268/vuwutigezu_jelelema_felisobufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bakotege.rf.gd/esc_guideline_heart_failure.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/aaru_songs_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/surface_area_and_volume_of_triangular_prism_worksheet.pdfIn PDF document text
    • http://nowutakifotekes.epizy.com/rulunosajumogudemive.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/acg_lower_gi_bleed_guidelines.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_off0000c2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A7 5908 bytes
SHA-256: c81ea35b1cdd3eac57bae2317d2319f1350e866a51ef15256809fe2c95467692
font_01_sfnt_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 10052 bytes
SHA-256: 663ca477e57144825025c59ca79ed93d9701fa6663c0d5fd63eb82716a581a93

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