Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ae33aad36cd44f…

MALICIOUS

PDF

78.1 KB Created: 2021-03-17 12:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 245863d6482ab21646c8e0f9f8ca04e9 SHA-1: 18bc50af6b6e357fadda6dd5b6d1bf5e5124fa88 SHA-256: 21ae33aad36cd44fd1b5910105cee55f7059d1e9b852c14d2b8fd3e70f2c7708
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=modern+talking+brother+louie+video PDF link annotation
    • http://fidofawi.medianewsonline.com/girl_scout_yells_and_cheers_english_lyrics.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/personal_branding_adalahghwek.pdfIn PDF document text
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/ba690ca20cd7b42.pdfIn PDF document text
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/951200.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/xesijopob.pdfIn PDF document text
    • http://menbp.online/cloudformation_s3_bucket_parameterkaxrl.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/8bd17cc7ecf456.pdfIn PDF document text
    • https://dobivevoxopu.weebly.com/uploads/1/3/1/4/131453544/dakolepari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_e9d4b9b019764a3295ef238a27f8965e.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_9c966b26f9624d5c9522af1febfb779b.pdf?index=trueIn PDF document text
    • http://zijiwaras.onlinewebshop.net/sonamalobetukavafazuri.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/1664844084.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_7dcc2b0ca88c4d8f9f66198dbbd7cd94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luropiw/new_south_movie_hdmoviemela_xyz.pdfIn PDF document text
    • http://danebusuji.onlinewebshop.net/taxajenugugu.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_ae1b30af900342d28f651cb0c92b6c3b.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_96f7438b61cd47738fd7830d30b3d81a.pdf?index=trueIn PDF document text
    • http://zezofakarol.myartsonline.com/cant_install_realtek_hd_audio_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/how_to_change_jump_force_graphics_settings.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_975ef5f6fc174953a9d7f1e476ffec4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/35734918321.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_ab59b207a2234c50bdcd32046aa3dce5.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_0feb65d082a24507a24e5587611e07c8.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_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 5176 bytes
SHA-256: 7d91a0a8971466878b8962ad863cef33df9f3f315308db6f470f51dcf19dcfd5
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 12108 bytes
SHA-256: 22e6da63f1b17307d9272c87f1b7a4726b06d090fb7c0b029b2d23a24016a777