Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cd2e66221b3863…

MALICIOUS

PDF

82.7 KB Created: 2021-05-23 07:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bc35a75513d97e04513a6c0874a726d5 SHA-1: 563fd921ae6f5ff23856337e7b6a17bf38b0a400 SHA-256: e3cd2e66221b3863176144ad396803f6352a2bace446eaac57a4bdfa1fbfa0e0
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 pointing to Weebly-hosted PDFs, suggesting a link farm designed to distribute malware or phish users. The presence of a critical ClamAV detection and a high ML score further support its malicious nature. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate a tactic to drive traffic to malicious or deceptive 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 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://nipisod.ru/strik?utm_term=download+neo+geo+full+version+for+pc PDF link annotation
    • https://zabemogir.weebly.com/uploads/1/3/4/0/134016966/zaboraxaxizorof.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/sanudasuref_bomebuja_duputisizoruzi.pdfIn PDF document text
    • https://retumitoratosu.weebly.com/uploads/1/3/4/2/134234586/58d58b.pdfIn PDF document text
    • https://rozinefowo.weebly.com/uploads/1/3/4/5/134576391/gumulumeni.pdfIn PDF document text
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/8773319.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/pusori/frankenstein_penguin_readers_level_3.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/91137859110.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/12300043293.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/destro_lock_arena_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/jutidozebexumol.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/how_to_reset_my_sentry_safe_code.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/jupobemuvosunizor.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/ayushman_bharat_hospital_list_in_up.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/evaluation_form_template_for_conference.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/anari_no_1_full_movie_480p.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_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 5472 bytes
SHA-256: 526a457cbcb65a7d70e1c1f6899de2fd3856908074caf932ee2af64d58e03d51
font_01_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 11832 bytes
SHA-256: c4771ef4d6f0c5777e06204247aa742900e9ccd477820d4076dba65238744a60

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