Malicious PDF — malware analysis report

Static analysis result for SHA-256 888055d8a3ea80cf…

MALICIOUS

PDF

75.4 KB Created: 2021-05-23 00:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3c65cc1306c2ae5fe52de8940c9defe SHA-1: c1ea49adc6ce30b4f5b8dea9ff3c44ff9195925d SHA-256: 888055d8a3ea80cf151bfbacfd915e332cc66c4c0a6f6750343389a1145d3bb1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=comment+attirer+l%2527argent+vers+soi+pdf PDF link annotation
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/gofolidanekamoponog.pdfIn PDF document text
    • https://bomutakarekavag.weebly.com/uploads/1/3/5/3/135330682/lewulajakekisuguruj.pdfIn PDF document text
    • https://liropesab.weebly.com/uploads/1/3/1/4/131454219/wuxitivos.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/tesapivijovu.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/dasudewo.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/nudofugasek.pdfIn PDF document text
    • https://lonopowixeza.weebly.com/uploads/1/3/4/6/134620564/261855.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/fetefam.pdfIn PDF document text
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/nobuzobebukajejikaji.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/xamibebulosaxug/zafivafagujipinudafibuvef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095a734c-7271-4c14-b4f9-141d051cbb88/35094425361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded4b9ca-e971-48a2-84b8-336857c8464f/nuretubogatewet.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/will_adobe_acrobat_9_pro_run_on_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3660deef-7114-4101-af47-5ca04927ee8d/is_auditory_processing_disorder_a_specific_learning_disability.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/78966688008.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/behavioral_activation_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/biriyani_songs_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c882bc5-619a-40a6-9865-f474deb1119b/bowofilerozozipumumaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20dfc5c3-98f6-421b-bfaa-618b6fa3b9aa/5950122790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75bcea4b-f2a5-4b2c-9dec-ac9d2e28d1b2/maharashtra_state_board_physics_textbook_class_12.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_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 5360 bytes
SHA-256: ace7d1cc7da087e253b1b6c8013dde1e4efa8d7394a9ef3500b35e6239dabfc3
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 11556 bytes
SHA-256: 1493832bca9147347e2d2a6f099c59dabbf18fe49390cd40b4a536f9bb5dff03

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