Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1a195345748edf…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 06:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: af23e146b6f209d7d4862d79628edcc3 SHA-1: ca432956aea93f5dcbaf4e3930a76d47fc00a487 SHA-256: ec1a195345748edf06b3f49065104a13ce8f55d560deb75b23ed3e69ad8e8962
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 0.9996

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://zajinet.ru/award?keyword=capitalizing+proper+nouns+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/amEgfWx/dining_room_ideas_small.pdfIn PDF document text
    • https://cdn.sqhk.co/kixikeli/4je9jhj/5074405564.pdfIn PDF document text
    • http://vemifamikoni.iblogger.org/estatuto_del_abogado_actualizado.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/06ljhhe/41156610207.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/4HicCvk/tinder_lite_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/jwigphd/hockey_jerseys_custom_canada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezebepit/waxipusixirodabenekite.pdfIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_bdbdfd3a7ea14f6cb75c0054c2cfb984.pdf?index=trueIn PDF document text
    • http://parubupo.epizy.com/turunokobonajememusesifa.pdfIn PDF document text
    • http://faxanudof.epizy.com/v_s_letter_whatsapp_status_video.pdfIn PDF document text
    • http://gapefixuwaxa.epizy.com/waybill_template.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_53bc091119d74dcdb33f384c42894b27.pdf?index=trueIn PDF document text
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_f541afce38124275b5bf9d8618a3b1f7.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_7a16f199b4d94b4390a0a4283124d92c.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_a9f200f5b7804ab487ea276d0a211520.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_900f32b0e21143d98f9aed574c40cf58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/fifiditajawifu.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/77317344293.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/mikorureweximijurivab.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_f4d75281c346488cbf7c2b843cf620a0.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_028d2d8ead9e4d2191cc47031d712c80.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_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 5412 bytes
SHA-256: a73ef98840e5b32df01d8d68e4c46e36918fa6168aaff2fdab92449944c2234a
font_01_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 11304 bytes
SHA-256: 0f9af4d5da347c63e384baa0196259b5ca76a84661eb33153e4926e34be8d37e