Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d71189da7ca0af…

MALICIOUS

PDF

72.9 KB Created: 2021-02-25 05:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4672326581628f6eaaeeeb511136fa52 SHA-1: 95d93450819e9804ab6c3c6b7eead9337ba8fb6f SHA-256: 09d71189da7ca0affa43b55b40ced61e5e691123b77ec45cad199b00a036f290
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an effort to obscure the final malicious destination. The presence of external URIs like 'https://maypoin.ru/wix?keyword=the+room+apk+full' further supports the attack pattern of directing users to potentially harmful websites.

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://maypoin.ru/wix?keyword=the+room+apk+full PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5fd7755816f5e.pdfIn PDF document text
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/1749185.pdfIn PDF document text
    • http://fallofelin.online/battle_chasers_nightwar_review_switchfj5lm.pdfIn PDF document text
    • https://kitowido.weebly.com/uploads/1/3/5/3/135348724/4343212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_600ce7b6d61bd.pdfIn PDF document text
    • https://cdn.sqhk.co/mozopojugode/ghhaied/drone_remote_control_distance.pdfIn PDF document text
    • http://fegebekuxew.22web.org/5th_grade_math_volume_worksheets_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_6031b9d8bcf9b.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/fuvuxilopuze-nepuwidiwekala-tazubiwepasegi-xadefigipefilo.pdfIn PDF document text
    • http://santaparker.store/honda_civic_secret_menu355e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384632/normal_5fe3c21cc1722.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/8e5c61.pdfIn PDF document text
    • http://serdyukov.pro/2010_chevy_malibu_ecm_issuesc9fr4.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/guwuzidu.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/volume_sound_boost_apk_app_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagelenobom.epizy.com/fotuwotirizoxekusi.pdfIn PDF document text
    • http://penalat.rf.gd/basic_english_assessment_test.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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 4976 bytes
SHA-256: d5b49872663ca18123e7b117da7cfe82ea3cb75ce9ec4f98a19b888dd510d0a9
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10620 bytes
SHA-256: 17f7b7a80853a16f281a272804f48092eeda059a8717140acadb3ecd3749dfc7

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