Malicious PDF — malware analysis report

Static analysis result for SHA-256 72216484f8345a83…

MALICIOUS

PDF

77.9 KB Created: 2021-02-24 23:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5b7b0a41f7b12e2118ae9901b2ac256e SHA-1: 960d38c023894ae0872b1e408dd477f640981e4a SHA-256: 72216484f8345a83b3c08522f9f9dff80def97173aaba65d75a9fd1708547a88
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to redirect users to potentially malicious content or phishing sites.

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 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://leonvi.ru/strik?utm_term=how+to+teach+full+stops PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402289/normal_5fdf3506be6e3.pdfIn PDF document text
    • https://cdn.sqhk.co/wuladupuzo/ixA2EsO/geek_vape_gbox_squonk_bottle.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/4ggc8jg/sixap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_6001f7c07a3bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415302/normal_5ff20770cae62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potiwivig.epizy.com/propiedades_y_beneficios_del_aloe_vera.pdfIn PDF document text
    • http://kokozebe.rf.gd/autoexec._bat_windows_98.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/diary_template_microsoft_word.pdfIn PDF document text
    • http://lulanikigog.epizy.com/form_authentication_mode_in_asp._net.pdfIn PDF document text
    • http://zebezepewit.epizy.com/zuzexizetoneji.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/17893979271.pdfIn PDF document text
    • http://dodujorumapide.epizy.com/43598590454.pdfIn PDF document text
    • http://pekarenov.rf.gd/23504281873.pdfIn PDF document text
    • http://luledajosa.epizy.com/dishwasher_repair_service_near_me.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_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 5060 bytes
SHA-256: d7745cb7e982783a90f6d0e773c4b20b360561b896ee52a3d1de7d0d90450a5a
font_01_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 10676 bytes
SHA-256: 1d26ea38e6b6e389ac27b292572a53fe0ef8fe7843b3ed721fce9c4c33d5cda4

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