Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c58956da04ad2b9…

MALICIOUS

PDF

74.6 KB Created: 2021-02-02 19:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ffe744e96e9ec55ebddda69d39594ab SHA-1: ff84225392086307766e440eb3fb0ea3f5b323f7 SHA-256: 1c58956da04ad2b99c5435f25f3ca266ea92be6ff3f54809de5a749c5c215e1e
146 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of malicious intent, including malformed streams and embedded URLs pointing to potentially harmful domains. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as 'https://seumenha.ru/aws?utm_term=weather+report+of+patna+last+week' and 'http://4kuhd.me/rofidivonitopuworowuxekr3p8l.pdf', are likely used to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/aws?utm_term=weather+report+of+patna+last+week PDF link annotation
    • http://4kuhd.me/rofidivonitopuworowuxekr3p8l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403959/normal_5ff2ad308072f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448720/normal_5fe2ccb5b26a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_60110443add6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_601413000e66c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499656/normal_5fd09155df787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/best_suv_manual_transmission.pdfIn PDF document text
    • http://najefitisefema.epizy.com/surudubofomexim.pdfIn PDF document text
    • http://wivowutone.epizy.com/hanuman_vs_mahiravana_full_movie_720p.pdfIn PDF document text
    • http://bukaduxanob.epizy.com/visa_invite_letter_template.pdfIn PDF document text
    • http://pabizazixivak.epizy.com/woderabimoterur.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/black_widow_movie_in_tamilyogi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 4900 bytes
SHA-256: bbdaf90742359fbbf94c9ea5e609333d32252693ae29c5b9dee9e099466e5d64
font_01_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 11320 bytes
SHA-256: 2eceeb2b02dd052ab52affbb3a16bdc6c94b9d904d6145bff115f9f32466e4dd
font_02_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.