Malicious PDF — malware analysis report

Static analysis result for SHA-256 34aff20dc823b1ae…

MALICIOUS

PDF

72.2 KB Created: 2021-02-25 06:04:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ca8bb9e91ae898e0cf953fc754b0898d SHA-1: fe8b92ac9afb291d34e455d1a2e42c92790a62f3 SHA-256: 34aff20dc823b1ae914546b6e6e4b19f27fbe7d1f09b88f86deebda7aa2ae31a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. While no scripts were extracted, the presence of malicious links and the ML classifier output strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=mucus+ur+sed+ql+automated+count+meaning In PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/kijukimoxubixu_mimade_zurufajurij.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/nanostation_m2_firmware_xm.v5.5.6.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/demisuvolowaje.pdfIn PDF document text
    • http://futup.ru/vefirikazixupib462g.pdfIn PDF document text
    • http://gifozazupu.iblogger.org/application_letter_template.pdfIn PDF document text
    • http://xogokobamategil.22web.org/supply_chain_management_jobs_nyc_entry_level.pdfIn PDF document text
    • http://pedalini.club/669716699251uixk.pdfIn PDF document text
    • http://usechambre.xyz/betway_app_zambia_apkru3ro.pdfIn PDF document text
    • http://circulshtangcalip.website/kogotivosupf1qwj.pdfIn PDF document text
    • https://dudasajaje.weebly.com/uploads/1/3/4/3/134362454/kitupeb-kajobitixezo-sinumasonowedeb-vupelo.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/intellifax_2840_not_receiving_faxes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonanikapudidak.atwebpages.com/what_can_you_mix_with_air_in_little_alchemy.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/3683410849.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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 5388 bytes
SHA-256: e390b51940af21189d03f4a319f65f36776a314a2705296080720ec974f2b0ff
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 11912 bytes
SHA-256: 95610fb44b01d93f07c0694d5e58a5e027fbe49048c98d30f75833cb17a98b58

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