Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5ecdd916459adc…

MALICIOUS

PDF

77.9 KB Created: 2021-06-04 13:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8441154d209a0e1c27e9730d161eb677 SHA-1: 0597a8dde47273f5a12a350692f42535e6390ff9 SHA-256: eb5ecdd916459adc96e3cb110cb364eef25b3552bdda6a37957d4674079cf719
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, with one pointing to `https://midufefew.ru/123?utm_term=video+er+for+instagram+app`, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://midufefew.ru/123?utm_term=video+er+for+instagram+app PDF link annotation
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/0eef18606d90f9a.pdfIn PDF document text
    • https://mutovowi.weebly.com/uploads/1/3/4/8/134862221/raladojabuvi.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/jesesevulojame.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/edb21.pdfIn PDF document text
    • https://funugunuxu.weebly.com/uploads/1/3/4/3/134384448/2436638.pdfIn PDF document text
    • https://jejabulalirolu.weebly.com/uploads/1/3/4/4/134464322/navunagukom_padexikesose.pdfIn PDF document text
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/31ffe44ef527.pdfIn PDF document text
    • https://zotexujefu.weebly.com/uploads/1/3/4/3/134322023/4185814.pdfIn PDF document text
    • https://koledino.weebly.com/uploads/1/3/4/3/134332835/valakurok_jinozoxab_lumulibuz_xetosifudofu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/937e4ea6-a6e7-4c60-b253-7437a1493bd4/minn_kota_ulterra_trolling_motor_-_auto_deploy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4463ed8a-ebcf-44ff-b406-eb745394e2d1/history_channel_salem_witch_trials_video_worksheet_answers.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/how_to_connect_denon_heos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f8ce32-1b47-44aa-81dd-27f2f2528eb5/certificat_de_cession_vhicule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a1208a-4563-4336-9b16-503a0fabf333/the_laramie_project_10_years_later.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/f/uniform_circular_motion_simulation_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03bb343-cfe3-4698-92cd-5ecb532739b2/51281154305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17e1fbf-7cfb-48db-9608-4a408b4fa8fb/sokiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ee084c-59b2-43a1-819c-84acaa83043e/how_to_get_hidden_blade_assassins_creed_origins.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_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 5296 bytes
SHA-256: edfaba81e584488794f067248f85eae8940487704c3406c05fb70a8fe4a28a46
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 11336 bytes
SHA-256: 14d305e749b944fefba3917b79b62d723e0e586fa0a96c13419b8bcbc4e89daf

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