Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9599f2a01ab4060…

MALICIOUS

PDF

77.9 KB Created: 2021-02-22 04:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 53706f48c1ad7034219fa0f662b3ec20 SHA-1: 04a429ee7327b8513f24e3aa5b2e27ede1bf188e SHA-256: a9599f2a01ab4060367eb08902fe6e9fe5814e22e91cbf4f580b2969f291988d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The sample contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs suggests an attempt to direct users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=self+esteem+activities+for+middle+school+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412575/normal_6015a1a96571a.pdfIn PDF document text
    • http://chategratis.online/baldurs_gate_2_romance_jaheira0703o.pdfIn PDF document text
    • http://help-bluebadgecenter.com/62260164109hz3jn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fec4d6c45303.pdfIn PDF document text
    • http://discount50.pro/211032000250q9t9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fe24046ce084.pdfIn PDF document text
    • http://parrrtner.xyz/jazz_super_mega_internet_offerb8rsv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5fecca28742b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404292/normal_60168b31317c8.pdfIn PDF document text
    • http://velixone.66ghz.com/pafugilerewupu.pdfIn PDF document text
    • http://avit0.cc/ramivomuwituvufibiduroe2cct.pdfIn PDF document text
    • http://vuzeliligovitu.iblogger.org/56977064515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_600c59a5da65c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fed2c0e9a006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_602551ac4ca05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_5fea0a3e2835a.pdfIn PDF document text
    • http://virnet77.ru/basic_accounting_principles_in_bengalif7xzg.pdfIn PDF document text
    • http://wumorumomu.22web.org/84164685241.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujulazi.epizy.com/arlo_pro_2_manual_recording.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_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5556 bytes
SHA-256: 5e66d117ffa9273ed9e1bea17983edfa53a3b4d4468533873fec0bc634e2f8ad
font_01_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 10580 bytes
SHA-256: 3f2e496e6cb9e4e509faa19e4b897ff01dfd39a37f09e4436d42a23fcb8e28d2

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