Malicious PDF — malware analysis report

Static analysis result for SHA-256 848b28b07becb4ca…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 01:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aff4e3f20a1041aa67c6709f4ce05a2f SHA-1: 7a0d2669e40b2af7d59e15c1c6b2b57935175953 SHA-256: 848b28b07becb4cab0703ab0471a620e30ac2cf3ef38e26892c73694e6cee6f5
136 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a heuristic indicating a payment redirection lure, suggesting a business email compromise (BEC) or phishing attempt. The embedded URL, https://druttle.ru/123?utm_term=reconciliation+discrepancy+report+quickbooks+online, is likely the primary vector for this attack, aiming to trick users into believing it's a legitimate financial report.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://druttle.ru/123?utm_term=reconciliation+discrepancy+report+quickbooks+online
    • http://gojavodevagajuw.mygamesonline.org/71526603551.pdf
    • http://tosefabebiribow.scienceontheweb.net/zeniniserujono.pdf
    • http://supobesopo.mygamesonline.org/26948883612.pdf
    • http://saxosoxajivovud.medianewsonline.com/86585010755.pdf
    • http://kuvezowepo.scienceontheweb.net/tips_for_job_interview.pdf
    • http://badoxik.scienceontheweb.net/73089781788.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_7aa79ee3db324bf5b3e4366df0215c93.pdf?index=true
    • http://jemileti.atwebpages.com/52489587628.pdf
    • https://uploads.strikinglycdn.com/files/01411a74-45bd-4998-a67a-c17c70daa5e6/whats_the_best_jump_rope_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/ae5fa3b9-7160-4e19-a20d-28d3fc49d776/what_is_a_2008_jeep_wrangler_rubicon_worth.pdf
    • https://s3.amazonaws.com/jupoti/zebaluseluwewirumitalazos.pdf
    • https://s3.amazonaws.com/retisovojor/aloha_browser_failed.pdf
    • https://uploads.strikinglycdn.com/files/7c41bfe4-1b0e-47b3-9089-154864f89a6f/dantes_inferno_canto_1-10.pdf
    • https://uploads.strikinglycdn.com/files/0c48919d-c938-4af7-a8db-d21ebc3b49a9/55770525890.pdf
    • https://uploads.strikinglycdn.com/files/62ddc03e-4e53-4849-82ed-8f54d6239404/26870156298.pdf
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_593fd9d9414743aca7a8aaf83c489258.pdf?index=true
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_1542be929f2b4d6a9c076e6cd84f2429.pdf?index=true
    • https://s3.amazonaws.com/wuxupewu/37231262998.pdf
    • https://uploads.strikinglycdn.com/files/48d3f952-6cb5-42bd-89bd-98c03447ff39/9375906367.pdf
    • https://uploads.strikinglycdn.com/files/4bf38012-256b-4a52-848b-85289db8398c/68641102646.pdf
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_1a3cc285d00b4a0791cdb7b127386511.pdf?index=true
    • 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_off0000f459.bin
948c3d3b5087b7c001818e6317dbcdbfee4b92ac93f6b162c33168f52266f78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 5504 bytes
font_01_sfnt_off00010727.bin
6ac48f0d08ef18376092b6ad807531ebc310aec9794cc0033402e6094fe696f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 10804 bytes

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