Malicious PDF — malware analysis report

Static analysis result for SHA-256 c992adbb4a720eb9…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 22:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe90c81e6d010928f5f09329ed28c477 SHA-1: 39aaa82d421e3ac0d0aff8e6a7c4b33918d21aec SHA-256: c992adbb4a720eb969dfcd024c2cae6e0edc6bc608b0dae4ba2416bc1f82d6ee
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/wix?keyword=quotes+about+guilt+trips
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/nulapag.pdf
    • https://cdn.sqhk.co/nodewanase/JGmljji/muse_dash_free_download_android.pdf
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/zekisazefopivenazo.pdf
    • https://cdn.sqhk.co/bovutolomevo/Hgh1Thj/tamil_love_status_video_for_whatsapp.pdf
    • https://cdn.sqhk.co/girewobo/qi9ifhj/lemon_slices_cartoon.pdf
    • https://vagenovujod.weebly.com/uploads/1/3/1/3/131398358/6ffd54a96212c5.pdf
    • https://cdn.sqhk.co/xamitarerivu/umghaY2/class_9_maths_ncert_solutions_chapter_7._4.pdf
    • https://ziwivebagojub.weebly.com/uploads/1/3/1/8/131871618/zasewax.pdf
    • https://tonudekosinin.weebly.com/uploads/1/3/4/6/134685286/a88d4cf9ec9f12a.pdf
    • https://cdn.sqhk.co/kepozote/CJtgeWg/62694049654.pdf
    • https://cdn.sqhk.co/figegixo/M1gdiiw/tugidojafajovorirazojisug.pdf
    • https://cdn.sqhk.co/visesefider/PhhOGgf/19740588553.pdf
    • https://cdn.sqhk.co/tudobele/9hcbagc/my_targets_archery_app.pdf
    • https://cdn.sqhk.co/dikapagoloza/b3ijhd3/hocus_pocus_costumes_sarah.pdf
    • https://cdn.sqhk.co/fokatekox/hjcNEJT/99031412532.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/47e63d1d-9372-4d34-b169-311228260bac/1100_words_you_need_to_know_flashcards_free_download.pdf
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_6f0e13f57ad244689468f3594d08d0a2.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_91cee6423677487299c3b53fc95861dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c06c788d-e11c-4ea1-b09b-0c4c498cb099/reglas_de_acentuacion_de_las_palabras_esdrujulas_y_sobreesdrujulas.pdf
    • https://uploads.strikinglycdn.com/files/6ca84a9e-e75b-4a4c-b303-2a7d1c445c97/how_much_does_chick_fil_a_franchise_make.pdf
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_68c191bbd3264dfbb1e01b0d294714b1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f7b3595-f33c-46e5-a182-207514a80f29/9891797096.pdf
    • https://uploads.strikinglycdn.com/files/5928223d-8d8f-43ac-847c-515bade227dd/57676925805.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e2.bin
eee048d8cdae6d4ce0be93c02c86fbc1a745f796ad9e49a75f439d524647a60b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 4964 bytes
font_01_sfnt_off000104ce.bin
8ff0b5bfd3421bc96da944615e06e0fa7f80deb55818dcb2c2609b38ecd1e4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 10832 bytes
font_02_sfnt_off00012995.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 4324 bytes

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