Malicious PDF — malware analysis report

Static analysis result for SHA-256 9460d0fe103dc854…

MALICIOUS

PDF

79.2 KB Created: 2021-03-29 04:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ed37ce35b900e5bf7d4157ae52cd1fe SHA-1: 7861ac59f4fa9ff28879eb354bfc6af682813675 SHA-256: 9460d0fe103dc854b28c31ca7c694afb0ea551ef2c1c33b00a0e8cbdfdf52d77
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://jottigo.ru/wix?keyword=delonghi+ew7707cm+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403410/normal_600487e6f3827.pdfIn PDF document text
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/kumogigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_6034facb9ccb2.pdfIn PDF document text
    • https://dozevexenunapaf.weebly.com/uploads/1/3/4/0/134017655/ridetateditapuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_60548805dec3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_5fd8277ed92af.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/joxibix.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/5643297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5febdd2c4b4c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doroxokile.epizy.com/mailchimp_christmas_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7c6f5e-6b70-4ec9-a148-391a7552e30a/jaffe_anesthesiologists_manual_of_surgical_procedures_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cdec4d9-63e0-49a2-a541-728a4afcc2ff/xiburiluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb29c0be-d953-4cc1-ae8e-4a6de1d9967d/99620550124.pdfIn PDF document text
    • http://zojimako.rf.gd/sakisexe.pdfIn PDF document text
    • http://bifameb.rf.gd/jutowoxuzotodevufose.pdfIn PDF document text
    • http://molodetagako.epizy.com/widafonipugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/323f80f6-212e-4ea3-9103-4a06f738a157/list_of_weirdest_place_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ec5c74-aa27-4957-8cb3-511db95a118b/puzasibidabagezoserum.pdfIn PDF document text
    • https://235be7ff-9b22-41de-91df-7a9e5ced5199.filesusr.com/ugd/4fa465_4e43fe1a7ec444c590c4cd50d2dbda41.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_7b5869119b7244e1982e903e0c40c43c.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_523a0baceedf4254adc05b6e95d4a71c.pdf?index=trueIn PDF document text
    • http://kagiwabiluwotel.epizy.com/21490010716.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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 5252 bytes
SHA-256: 7d5dea4a87e7cefee15d4a5bc4c22529d8cbd5999a6000c7e974e5a0d40a9308
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 11016 bytes
SHA-256: beda67b78816f402dd2c6c19d6d7c3d6b91a30ccb9a28145254906a0ea2d0988