Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33e4f4eeea03aac…

MALICIOUS

PDF

87.9 KB Created: 2021-04-01 17:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c9a07ab50a606952ca1461767405f5de SHA-1: 092f67eb732ba9732166a8c4cb2ec8689d3df00b SHA-256: e33e4f4eeea03aac46ba59828ffcce2d021cbbd3d898317792da04da46b40bbf
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'exercicios de ingles' and 'gabarito pdf', likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=exercicios+de+ingles+simple+past+verbos+regulares+com+gabarito+pdf PDF link annotation
    • https://bixunirejo.weebly.com/uploads/1/3/5/3/135329058/makazirebokogaw.pdfIn PDF document text
    • http://nesobaka3.xyz/75545658630qzi99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_601fbaa4446be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_60243a2942ca4.pdfIn PDF document text
    • http://logmeinnow.xyz/the_spectacular_now_netflix_canada8xs2p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5fddcfcde9dd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_60394c9b3b711.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/kijebuzopunu_fasabibimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_60471cef587c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_604f8ca02aa64.pdfIn PDF document text
    • http://reduslim-buy.site/class_diagram_for_hospital_management_systemktc0a.pdfIn PDF document text
    • http://zexorusawuwurew.sportsontheweb.net/norma_asme_b31_3_en_espaol.pdfIn PDF document text
    • http://medicalpracticementor.com/patent_search_analysis_report_psar_11j2n6.pdfIn PDF document text
    • https://poxejiwexoji.weebly.com/uploads/1/3/4/6/134639112/ganuxelunif.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/chinese_english_visual_bilingual_dictionary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_6062d10673452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d67ef8b-df5e-4979-8cbf-e7293e2dc627/vavokofanored.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/citizen_drive_from_eco-drive_ladies_rose_gold_tone_strap_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a714d4-88e2-4122-8c95-e5f4f81ce0e3/what_order_do_you_read_the_rick_riordan_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380cc1b9-4643-48ef-9a7f-46462709c651/mary_poppins_returns_cast_from_original.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7254004-92a9-442a-87f6-fa97686722d7/dewalt_3600_psi_pressure_washer_oil_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707b557c-c4f7-4a66-b25d-40880cc0bd31/88731830820.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 5700 bytes
SHA-256: 68abed4d6d5e5df7cbafb3963b9feb3d536f1c70b19d594cc088f4b37ae16817
font_01_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 12876 bytes
SHA-256: 5cc2ae46305927a04d26a7430a2b59f66c0718f29e3534cab7e1212067b40877
font_03_sfnt_off00013723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13723 16668 bytes
SHA-256: 2719890215df42bb4defd9a6410ddc572135828a26cc56d5464c3cdb7883a145

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