Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cf677fbdc246a8…

MALICIOUS

PDF

80.1 KB Created: 2021-03-16 03:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa4513519a57d5525c7a40102cad533c SHA-1: 50787bcdfd147737ad207d5c45e13f81b5f83f67 SHA-256: 87cf677fbdc246a8b04e53ae95237aef18ac3ba3686bb8f9df993636e9437bc3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, with one primary URL identified as malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect the user to a malicious site.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=resumo+de+administra%25C3%25A7%25C3%25A3o+publica+para+concurso+pdf
    • http://kagotigidiwijar.iblogger.org/how_to_get_adobe_photoshop_elements_for_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4e430a7e-ab89-4ba4-a7b9-81804b6d2fe0/kenmore_connect_error_code_oe.pdf
    • https://s3.amazonaws.com/wovitiku/55570380703.pdf
    • https://s3.amazonaws.com/jazuravazaguz/joraluwes.pdf
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_dd131e8e4d5a4b459711aea93f4f2070.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b07c280a-b62a-40f4-adaa-2725389c06eb/sutanak.pdf
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_606e542dfc21440a9f3c806d93476c22.pdf?index=true
    • https://uploads.strikinglycdn.com/files/748410e1-1d07-4949-aa38-1a968cb492db/xurexe.pdf
    • https://uploads.strikinglycdn.com/files/e0001774-f564-4ac1-a92d-e724fb44953d/63013249619.pdf
    • https://uploads.strikinglycdn.com/files/dac5db05-e5fb-4579-a2ef-c94dc76c47a5/aota_occupational_therapy_profile_template.pdf
    • http://tivusanezidiv.rf.gd/mobepel.pdf
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_d4de6be3dd7f4d1fb5721e371e42e7d5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/79ae23e7-d3c9-4cc7-8bbe-69523474ca20/dikodumozetez.pdf
    • https://uploads.strikinglycdn.com/files/b0ed328d-967b-4054-ab67-0ae71b7dcd74/monster_energy_v_red_bull.pdf
    • http://vawutalakomu.epizy.com/52005770339.pdf
    • https://uploads.strikinglycdn.com/files/7529b1ba-9e15-4c5e-9647-952ef07a497b/briggs_and_stratton_18hp_vanguard_engine_carburetor.pdf
    • https://uploads.strikinglycdn.com/files/d0ebdd46-d31b-4cf8-b454-258f9b234950/38747353381.pdf
    • https://uploads.strikinglycdn.com/files/14a5e87d-1525-4777-ab67-88e351444528/48735225950.pdf
    • http://temadama.epizy.com/moxupuwojevudedirarep.pdf
    • https://uploads.strikinglycdn.com/files/b6ece4a4-7121-4dc7-b462-0905ab735346/85915474009.pdf
    • http://kagokonutuvep.epizy.com/yoga_asanas_book_in_hindi.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_off0000e8bc.bin
ef30d3490df310bfddd7761e8726a643b7a6e550a80fae48c46ac56f39b35fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 5828 bytes
font_01_sfnt_off0000fb8d.bin
e0e45a7fe97cacf3a04d8b7c76fc423430bea64918f917fb0fa18c1803f57e41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 12780 bytes
font_02_sfnt_off00012269.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 4324 bytes

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