Malicious PDF — malware analysis report

Static analysis result for SHA-256 23131e96a0c5c4fa…

MALICIOUS

PDF

80.6 KB Created: 2021-03-18 13:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 23744f9713529a5acae1e4aa00122c0a SHA-1: 4757c02535a13023e9fce805725c0e2fd2b5b017 SHA-256: 23131e96a0c5c4fa3f46a38c59082ea78eec9f7c733af38f518a650de3b53e4a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to SEO-optimized PDF documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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 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
  • 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://kuzutuzo.ru/strik?utm_term=sharp+65+inch+tv+specs PDF link annotation
    • https://cdn.sqhk.co/wozejodes/b5YpWha/att_tech_support_360_backup_and_go.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/heMf6jg/current_diagnosis_and_treatment_infectious_diseases.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_6010c51cdbeea.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/Ijaidck/smart_connector_ipad_pro_keyboard.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493891/normal_5ff52d39bcded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_602d0eab11448.pdfIn PDF document text
    • https://xujajogasugoni.weebly.com/uploads/1/3/4/5/134514057/vikezi-fuxiz-gugajof.pdfIn PDF document text
    • https://cdn.sqhk.co/bujugasefoli/hhiesgj/595213089.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/fa794.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/fhis4mM/funniest_song_ringtones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_6049bd1dcfcda.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/ghhe9wl/can_you_escape_6_level_46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378845/normal_5fca4cf44d2be.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/TgfVibq/characteristics_of_report_writing_in_business_communication.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/levovod/10412462939.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/blown_away_1993_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12bd72a-76f6-4f86-b681-41058cadd770/51568384169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1665dafc-d741-4220-9dff-2533e4961104/is_it_better_to_guess_or_leave_blank_on_sat.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_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 5428 bytes
SHA-256: 0e65c2e646f9556bfd2af22c7c4f5c2b67c14a51f5a709ef8008f3394e4c50fb
font_01_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 12180 bytes
SHA-256: 8bcd5dc7dbd367a5e33338795a084cbd55456d24b01eed593d8624d04fbd71ab

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