Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64ed604980dcf06…

MALICIOUS

PDF

69.1 KB Created: 2021-03-10 12:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b4567f577c77753edbfb219e4f5cf7ed SHA-1: dcf6eab551a1af0d01be7a427704990127c82b0a SHA-256: a64ed604980dcf069ed34d85ac441cc3dc94d8a69a39af7179d78fff1d578e0b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=how+to+reset+zmodo+camera PDF link annotation
    • http://liwugukikijosi.iblogger.org/christmas_church_bell_sound_effects_free.pdfIn PDF document text
    • http://shop50off.info/77834965368a8kcx.pdfIn PDF document text
    • http://circulyarkadigital.xyz/how_to_describe_a_beautiful_woman_poemd0b9a.pdfIn PDF document text
    • http://tiktokfrance.fun/rinovawi4dufl.pdfIn PDF document text
    • http://kataeta.club/xokiloxotokotegk603m.pdfIn PDF document text
    • http://itsamorem.com/baby_satin_fitted_sheetsf42ko.pdfIn PDF document text
    • http://megarafulosibef.22web.org/naretogovedas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_de61acb8d3734cb5a2b27c7cef657367.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_403bf6f2e14a40369cad85a7a1a71fdf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc38e02-5b29-4547-aa54-683a66f1c736/tizepesopidodaves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb5c56b-7e51-4cc0-9e48-7385cdc66388/how_to_install_maxi_cosi_pria_85_max_rear_facing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be1ae72-74d5-4342-adbc-861a5f089085/samsung_smart_tv_55_inch_4k_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71494414-5ef6-4bc5-b880-8983c7353ae5/wezegade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7bbe6e3-53b3-44f5-bf23-9ee61130a861/16483461079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b14ec10-bb6f-46b4-b41f-6a6c922e5341/risawoputemifurivuzof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4896d0-7e2c-42d5-a881-178991fc564c/16290252902.pdfIn PDF document text
    • http://vawobalen.epizy.com/kiwanifaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845de842-90ad-4483-9f4b-e0b548c1fcb0/3116381848.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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 5156 bytes
SHA-256: 70b083d0c878ff408ab521c64bd568c1fbda685947835a4c8ba48c03e348e5e2
font_01_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 10840 bytes
SHA-256: 5d2262891b9916b4f7a9e00566790d4337ce30b9f6c26d5b879f27fcbfd0a7a0

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