Malicious PDF — malware analysis report

Static analysis result for SHA-256 90beca2f7b7a4ba8…

MALICIOUS

PDF

75.2 KB Created: 2021-03-11 10:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59c0d23e6b3bf52af18672b5b83015e1 SHA-1: 1f2a962b6ddf36fc02987664935de91393ce7513 SHA-256: 90beca2f7b7a4ba8ce71f23ca79376eeb4c03ecf2596cc349d61c8f8e3428343
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or SEO link farming to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=cisternas+cerebrales+pdf
    • http://bopugafuwu.scienceontheweb.net/billing_system_thesis.pdf
    • http://filozajerezabi.getenjoyment.net/dream_interpretation_snake_bite.pdf
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/7334039.pdf
    • http://saxobupazes.sportsontheweb.net/lezox.pdf
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/2643071.pdf
    • http://jekeluxuto.mywebcommunity.org/nodigunag.pdf
    • http://sudilufib.getenjoyment.net/what_are_the_main_concepts_of_oops_in_java.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_e059bdd7b49643d38c9ba3312ca3c2fc.pdf?index=true
    • https://s3.amazonaws.com/jeponowon/57855811578.pdf
    • https://s3.amazonaws.com/woneketelak/hungry_shark_world_infinite_coins_ios.pdf
    • https://s3.amazonaws.com/tubukeganuji/lcd_16x2_datasheet.pdf
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_8c06b973e95947e5a7f89e9f4ca4e8d8.pdf?index=true
    • https://e5dcaee6-2491-4626-aa15-785a320bd457.filesusr.com/ugd/be19e1_c682050b57e44ed0bb7afda545cc9c94.pdf?index=true
    • https://s3.amazonaws.com/satuja/bar_headed_goose_call.pdf
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_c9c90dee60a94ab0a996499f4322125b.pdf?index=true
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_7836ea78b9da44d2a50aad6ac0e1e465.pdf?index=true
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_8a0218e4d90c4876bb75267c9bfe55c7.pdf?index=true
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_4b3ba4dc70be4b59be3f69d6e84301dc.pdf?index=true
    • https://s3.amazonaws.com/mojivikapeti/alberta_education_diploma_forms.pdf
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_c76b6187b88142e891faccf48305a9ae.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e810.bin
e7a09c1014c1cd69e26b8aecd6fe3e176595f659bb5731139359f6449fb4bb33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 5196 bytes
font_01_sfnt_off0000f9bd.bin
25e5f2ecbf02c3fa29da973d7d01938c39bb892400af8e5af1e1d4812f43f983		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 11184 bytes

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