Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4432f7a49f97e57…

MALICIOUS

PDF

66.0 KB Created: 2021-05-11 16:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f60464893636016e8098c4d90595422 SHA-1: 56e509ea704b7f54f80fd9c024bd6dfe536c9243 SHA-256: c4432f7a49f97e57e3a50ce619e6157c8b7dcab18d752e7a5997bcabead25964
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and one primary malicious URL. This indicates a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=governing+california+in+the+twenty-first+century+pdf PDF link annotation
    • http://sazasebum.iblogger.org/waxepamaximab.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/8CSgege/55269503755.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/how_do_i_use_my_nespresso_aeroccino_3_milk_frother.pdfIn PDF document text
    • https://nunavataregexo.weebly.com/uploads/1/3/0/7/130775742/f0da33de95be.pdfIn PDF document text
    • https://mekaxojukana.weebly.com/uploads/1/3/1/3/131379168/aac303fc.pdfIn PDF document text
    • https://cdn.sqhk.co/savekedeg/egdRYNE/96195788734.pdfIn PDF document text
    • http://tokigarodam.22web.org/68332811459.pdfIn PDF document text
    • https://rikomurisixub.weebly.com/uploads/1/3/1/4/131454733/3622840.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/18250257720.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusawaja/jiCwge3/fediduwetuvutizowugur.pdfIn PDF document text
    • http://zedukibawubige.22web.org/organic_conversions_worksheet.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/4ac4ef39af.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/1gfcGv0/whatsapp_update_latest_version.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/electron_configuration_rules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_707f5877ab074f529cfcfae926bf1086.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_213b23375ecb4add83416e1814448285.pdf?index=trueIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_959c7234178a4ce98472a41103a4c0dd.pdf?index=trueIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_68e1f416f0e2415abaf48007b592a8e6.pdf?index=trueIn PDF document text
    • http://visugog.myartsonline.com/ketapulavinumupugoxeruzu.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_4fafb86cb8604b1ab94eeaeec4af53de.pdf?index=trueIn PDF document text
    • http://vobozezojip.onlinewebshop.net/35301531619.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_4e936cef108749969315a9827205d751.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_53a93b92d6644007b63172e528f25c5f.pdf?index=trueIn 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_off0000c571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 5736 bytes
SHA-256: 36767a8093b2a9690d0a517cac3ef7005c4762a33286f6c8ac383ab92678139a
font_01_sfnt_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 9708 bytes
SHA-256: c831a0aec13819fbfc1db9ca54734d5f1a5e08769524c601771f32c9f80cd0c4