Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37280f58e69a392…

MALICIOUS

PDF

89.6 KB Created: 2021-02-19 01:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8aaa8158490ef82e2477eae509a6d02a SHA-1: 8ce5329ac17b46f0ed5caa798401f67dca1facac SHA-256: e37280f58e69a3929a83ca387f5f07a441866452d8d63eebb54dc6a73329c132
146 Risk Score

Malware Insights

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

The PDF file contains malformed streams and numerous external URIs, indicating it is likely a malicious document. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to disposable hosting and link farms, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/strik?utm_term=strong+verbs+worksheet+3rd+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447251/normal_601bad025558e.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/9821567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_60175c423711e.pdfIn PDF document text
    • http://pro-komp-master.website/552570045188p7x.pdfIn PDF document text
    • https://sutujiwujuso.weebly.com/uploads/1/3/5/3/135390810/ca3a2493146ba0.pdfIn PDF document text
    • https://refunijuxi.weebly.com/uploads/1/3/4/7/134748157/titatesiwinizipirom.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/XiCpnIS/higan_gba_emulator_for_pc_download.pdfIn PDF document text
    • http://missunik.space/gukaromazejeo9bpw.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/S4QVkFo/jukujoboritopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481510/normal_600850aa0376e.pdfIn PDF document text
    • http://maxist.ru/goodbye_letter_to_colleagues_templateqsk3n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_60255e55553f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393033/normal_5ff1b704f2b4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fe2a202de31d.pdfIn PDF document text
    • http://cmb-societe.com/nuvowaxijamevikemdor8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5ff8c2fd19e33.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/nowokil/cameron_dallas_she_bad.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/croquis_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/buxuduku.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_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 5676 bytes
SHA-256: 6363dd2ec6ce7c98ae3bf5b634fca1291e498432bfebf9359e57eabaeb3fd31b
font_01_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 11776 bytes
SHA-256: c3cb8541318393aef6eb550aec363ac8abe0ffbb3946017498607b5105f78160

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