Malicious PDF — malware analysis report

Static analysis result for SHA-256 7017ab3e6e8d94b4…

MALICIOUS

PDF

82.2 KB Created: 2021-05-28 05:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d3203ceb6318407cbfac1bf2c0982345 SHA-1: ce5888a5d492cfbde4cceca84bd8cd4d61f0a93c SHA-256: 7017ab3e6e8d94b412b17ad8666a95a51ae4308c5638fcd9185116f92e8c9a68
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 0.9994

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://resalured.ru/strik?utm_term=how+to+prepare+ethiopian+coffee PDF link annotation
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/9c027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_6028abda6cd02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fd6f2923c501.pdfIn PDF document text
    • https://rapekazojeroxe.weebly.com/uploads/1/3/4/6/134697974/43802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6048428cece5e.pdfIn PDF document text
    • https://gemiwanot.weebly.com/uploads/1/3/4/4/134495393/52c134.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/tusifofa-wodisidi.pdfIn PDF document text
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/6418903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_600a0677ec85c.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/matuwujib.pdfIn PDF document text
    • https://teguzefememefa.weebly.com/uploads/1/3/4/6/134609716/8244857.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/99df4e8b-ce72-47a3-a51f-e467057a6876/why_do_i_have_a_red_itchy_spot_on_my_scalp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a8f85a-ae20-4131-8607-9f7c925ef043/51576562240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd753721-9580-43f5-b243-c92ce5be934e/descargar_musica_de_los_temerarios_mix_para_enamorarse_mas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331a1318-6f35-4675-abb7-bf3efe7d3dfd/giinii_gd-250_dash_cam_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358359a9-142b-424d-8629-a0556aebb4a1/gadinikog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31bb11f-134e-4c33-ab20-cc37bc33cbf3/song_of_the_lioness_omnibus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1febd0-de62-4299-948b-a2e1f58c5ac0/dell_2001fp_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b55ea3-a9b8-48ca-b48c-09ae08807547/1753689719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464369fe-36ec-404c-8985-294b13c0b47d/kirojolov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05b3a89-80ef-45fd-a428-c77e90944d2b/kategotolanidonuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf0d2c6-3f87-491a-a09f-6de1a2a74963/how_to_set_up_cricket_mobile_hotspot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f747d1e-7643-42c1-80e6-dd92289118bc/31143682544.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_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 4944 bytes
SHA-256: efa8781a248c2a5014be7286f45e76a3f31ca4bbe20310d7a316cd57ba501c11
font_01_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 11196 bytes
SHA-256: 3e77ea16f14f0a1399af84b190f6dc0963a190e13f46d29323e73e8c566c5f17