Malicious PDF — malware analysis report

Static analysis result for SHA-256 96721baed74b9d0e…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 01:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93cbd2faf2fd3bb1527df2a75ddc3431 SHA-1: 00f49270f6b2be2a806b6a79ececd22358027e6a SHA-256: 96721baed74b9d0e2631aa865aeb1b3861a3a45664a8f406ccdaa23bb587fd57
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to drive traffic to external URLs. The primary malicious URL identified is resalured.ru, which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=citra+android+crashes+when+loading+rom
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/a4cc9a8404120b5.pdf
    • https://cdn.sqhk.co/dikapagoloza/b3ijhd3/hocus_pocus_costumes_sarah.pdf
    • https://cdn.sqhk.co/lijuwezasip/aY88KV8/run_rabbit_run_2019.pdf
    • https://zisojuvamifofe.weebly.com/uploads/1/3/1/3/131383842/rerapemeworogi_vanon_toxesuxudal_zevogomakez.pdf
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/lakafem-zijarebafaw-dokidazineviza.pdf
    • https://cdn.sqhk.co/rirexiwudag/ggshhxB/777_live_casino_app_download.pdf
    • https://cdn.sqhk.co/tonukabonuwe/difIjdT/pozarinixo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ce3c407d-5756-49d5-af37-8b9b9d696d7e/24068689580.pdf
    • https://018ae6bf-5b6e-4bf7-bb5f-89503284f855.filesusr.com/ugd/b7931c_9dedb41726574dd0a39e648f47328a76.pdf?index=true
    • https://s3.amazonaws.com/wiremeresegikon/36949223852.pdf
    • https://s3.amazonaws.com/wipotegadodorek/italy_visa_application_form_editable.pdf
    • https://s3.amazonaws.com/tobaziw/alcalosis_metabolica_en_neonatos.pdf
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_00a60b6ae32246c182a748424b7d7511.pdf?index=true
    • https://uploads.strikinglycdn.com/files/681d4329-57ab-4cd1-96dd-8c1233580823/netujo.pdf
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_9b2c1d1de3fd43ea9d07116d1eb3878f.pdf?index=true
    • https://s3.amazonaws.com/pubopelej/24332227065.pdf
    • https://s3.amazonaws.com/regovadeje/counter_job_offer_email_template.pdf
    • https://8e75e8be-0f37-480b-85ac-641553c1acf9.filesusr.com/ugd/a4a1ce_56881be41e7442b9abc798c6a17866a6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d34b878a-4538-4da7-83d7-c3aef8cb4457/craftsman_weedwacker_25cc_how_to_install_line.pdf
    • https://s3.amazonaws.com/zamuriza/galaxy_s7_android_9_oreo.pdf
    • https://uploads.strikinglycdn.com/files/43fe4912-1182-4600-8462-58264bcf08d2/does_my_hyundai_sonata_have_a_recall.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e477.bin
79c3b726c9d3a3c7674984e41c72787941b379f970241b1754284ba692743c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 5256 bytes
font_01_sfnt_off0000f638.bin
9998f90ea50d308f94d272031c69b1ba6c40ac42c2ff580c4c7a4ff39c28e8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 11472 bytes
font_02_sfnt_off00011da6.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 4324 bytes

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