Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf3cc424b8e42ad…

MALICIOUS

PDF

72.8 KB Created: 2021-03-09 23:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87aac34bf1838dfe31e593df3f5e95b6 SHA-1: 29a08b135e128ebdf56eb7c3435924b4d67eca97 SHA-256: 7cf3cc424b8e42adfb67416668ac92b6ea1da8bdf8b8c6f6c600376c0a3c1f46
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain ('resalured.ru') flagged by heuristics as part of a link farm. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=alternative+fuels+nptel+pdf
    • https://sifavebizibi.weebly.com/uploads/1/3/4/0/134040704/d2418461b3d97d.pdf
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/xofuwok_tusidewawobuf_nawudazetuxo.pdf
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/nuzigexevubudu.pdf
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/2257907.pdf
    • https://nilizexuv.weebly.com/uploads/1/3/0/7/130739046/fijudaziwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4aedbde9-d17f-488f-8ddc-90c82ad29364/intercessory_prayer_scriptures_for_healing.pdf
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_46194a4337fd4794833742190903606c.pdf?index=true
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_2243dbcd7f654978aad89e8a513500c0.pdf?index=true
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_bb84499703b04d1482ea0e5841e61032.pdf?index=true
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_e6ff6daf2afa44f2abb4633b1b819047.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2147ccdf-87b9-44f8-a4cd-e26f85f57bb1/xavikavevak.pdf
    • https://uploads.strikinglycdn.com/files/a0ac95d2-ade5-43ff-849d-f2c1948ad562/36713700761.pdf
    • https://uploads.strikinglycdn.com/files/edcb687e-7fe1-41ed-87b4-b26ee7170896/principles_of_electronic_materials_and_devices_4th_edition_solutions_chapter_3.pdf
    • https://uploads.strikinglycdn.com/files/9fc13fa8-d078-42ff-afa7-7afc74117305/meboxajakuj.pdf
    • https://uploads.strikinglycdn.com/files/9ca28aff-b5ce-4e2b-9f21-41bd1d06f2f9/39785398386.pdf
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_f837f2def47f4442a558692a133ae426.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_4b2a876844ff4842834d2453e812dbd3.pdf?index=true
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_8c5db20958a447c4b9fb379f7c24d7fc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/447616df-635c-43ed-9d90-842cb5746504/88351595406.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea2.bin
5877ac450473909eee836f89846bed29c79c4bf33d00f614f9dc128751325817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 5084 bytes
font_01_sfnt_off0000f006.bin
6ba33ddb482cdb2ae58e19227262b99625fe82c12d65d060e1f61442505436d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 11868 bytes

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