Malicious PDF — malware analysis report

Static analysis result for SHA-256 8994c6ad55f50530…

MALICIOUS

PDF

117.5 KB Created: 2021-03-18 21:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 451c3c89d1e3e3f32500dd5c9bef68d2 SHA-1: 4e4450379696e7528a5e4dbd0e67202cf3371280 SHA-256: 8994c6ad55f505305d9f703994a6f6d34b60904f407319ac9734877d22b7c677
226 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. It uses a password-protected-archive lure. 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 0.9995

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/award?keyword=auditoria+informatica+antonio+echenique+pdf PDF link annotation
    • http://wajofima.mywebcommunity.org/sarmiento_civilization_and_barbarism.pdfIn PDF document text
    • https://vunatoja.weebly.com/uploads/1/3/0/7/130738644/1161778.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/pofoxelodo.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/17a684954c39.pdfIn PDF document text
    • http://tehnotop.store/tenvis_camera_setup_passwordp3iff.pdfIn PDF document text
    • http://sarhello.online/mupovuwaterarajazojd75k.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/abbyy_transformer_12.pdfIn PDF document text
    • https://sazuwigigaxav.weebly.com/uploads/1/3/1/4/131407293/nixubuwen.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/pafareba.pdfIn PDF document text
    • http://geloritiveda.mygamesonline.org/mansions_of_madness_suppressed_memories_out_of_print.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/xizagorisozajixado.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/764a7.pdfIn PDF document text
    • https://wakolixib.weebly.com/uploads/1/3/4/7/134706528/3480235.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/zitobanezixedab.pdfIn PDF document text
    • http://kprovk.xyz/beechcraft_turbine_duke_performancegnqp7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_c3991ac8a0ef4cdd9df49fa55229476b.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_0b327c706efa4a70b6dadedab52f53b0.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_cc6312986cce453fb77a1cd4d2fb15fb.pdf?index=trueIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_4a8c7ac831564985b62fb07a0413c0e5.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_7b7932d89c6f408d8bc29f3a07775783.pdf?index=trueIn PDF document text
    • http://rixibedi.onlinewebshop.net/madasesovaf.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_8c3acca6bbb44b4ba29b646269c65cbc.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_4566273f6b364cf29a5b73ba70b701a8.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_889c328c38be429fb4c927611ffc0dfd.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_d6ce64f9c2d34142bfa036fade4fda8d.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_off00018972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18972 5300 bytes
SHA-256: 6110fa921a16592cd811fff91ac35ef4a0c546a00496cbf6478c5d9df4fde810
font_01_sfnt_off00019b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B50 14168 bytes
SHA-256: 8c5e6629293e3cf7a471b42d14adda9326a3f2587516983f5e0f6995c119b710