Malicious PDF — malware analysis report

Static analysis result for SHA-256 026a3cd7364f7082…

MALICIOUS

PDF

73.1 KB Created: 2021-03-15 22:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: fe50f62de467c142cd8b94ec0b715eb3 SHA-1: 52af6f9923dd0154f9de4734d8a0c241fbfd6037 SHA-256: 026a3cd7364f70826045c636aa965e1fc56d937b26a1ed43e75b6796f5129367
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document's structure and the presence of external URIs strongly indicate a phishing or scam attempt disguised as a worksheet answer key.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://druttle.ru/wix?keyword=addison-wesley+publishing+company+worksheet+answers+for+science PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4530578/normal_6038df935b769.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/8ggEjgc/asphalt_street_storm_racing_android_gameplay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_60087486c8e39.pdfIn PDF document text
    • http://urott-hu.com/womuxewilukuwiwadi5ynu.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/ue_boom_2_mit_pc_verbinden_windows_10.pdfIn PDF document text
    • http://avto-trokot.xyz/neato_botvac_connected_manualeout4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_604668bc1c636.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/sundara_kandam_tamil_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_5ff2321d7725d.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/sjg06ib/kode_pa_apps_android.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/fozegorurapusomezoluvi.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/IRXgdlN/fewof.pdfIn PDF document text
    • http://aycotoro5.xyz/nsfas_agreement_form_2020rh4u5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_603193d1ee279.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/bamigebexavedafixof.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/qKu8Yjf/popsicle_stick_bunny_crafts.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/idiom_dictionary_free_download_english_to_sinhala.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/29047009627.pdfIn PDF document text
    • https://cdn.sqhk.co/gaduwifawide/ghjhgeu/environmental_impact_report_ceqa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_1ee7a1178d434c9699338a721e657cc3.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_5bb1930d600c4090aa7a1b7a92bdbbfa.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_4755f8f840db4f35858c217005bd28ff.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_0d8c42be667e437cb756e822f1facd46.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_eb28f13553fa4cc99788718717a08950.pdf?index=trueIn PDF document text
    • http://nujugeteteda.myartsonline.com/data_science_major_colleges.pdfIn 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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 5988 bytes
SHA-256: d9f4e78827629f17b31196475bcecab34c38e68ad93ae2408630e9ab1f2a9600
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 10312 bytes
SHA-256: 3b44729a0954c3e7636b8f56ef478b43915d23f5bd7e62c3e9061ba95b1b49c8