Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a9e7fb8f258abc…

MALICIOUS

PDF

97.9 KB Created: 2021-04-27 08:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b1ad1008433f860a9992f42960c2a73d SHA-1: b07caf25977f561c6e0f7abfe2c2d3a0faf7986b SHA-256: a5a9e7fb8f258abcc88ee83c319580fef1f869a6d9ddd9a39f8bdccaad2818ef
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=effective+practices+in+early+childhood+education+pdf+download PDF link annotation
    • http://pojibuvuj.mygamesonline.org/consonant_sounds_and_examples.pdfIn PDF document text
    • http://clubstore.info/polaris_rzr_turbo_manualpa6ro.pdfIn PDF document text
    • http://my-favshopf.online/9545138551zqqt1.pdfIn PDF document text
    • http://a1metromovers.com/how_to_turn_off_a_first_alert_smoke_alarmkixma.pdfIn PDF document text
    • http://servempieza.site/kunasaxoxugovipe7t18.pdfIn PDF document text
    • http://nuverlites.online/jetufudadokijaxedzs95.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/naligibarubuvopatejilim.pdfIn PDF document text
    • http://zasufigonibat.getenjoyment.net/kezupiposadudiraganufi.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/f7eb68c0-9a16-4d12-b60c-556f249a6933/67952811734.pdfIn PDF document text
    • http://jidaxel.rf.gd/digital_electronics_objective_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3926b0a-2259-4346-ae43-dcc0aa7838f5/xusuvelomovanosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ece4ab7-d5ab-4a7f-829b-339eb30cdb4d/scary_stories_to_tell_in_the_dark_download_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cf5698-a2ee-400e-9e3d-b5c26596718f/92532425635.pdfIn PDF document text
    • http://lovenewaw.rf.gd/bujalozosexotologasar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964a4528-0fee-413b-81d7-fd4fea6b7c68/how_to_use_braun_digital_thermometer_with_age_precision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b052ff62-cfaa-46e5-8011-f53830bde0db/canon_eos_rebel_t5i_charger.pdfIn PDF document text
    • http://gozuketitara.onlinewebshop.net/45926505330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e116a0-3609-46c9-84a8-8b4840422bf6/cisco_router_configuration_commands.pdfIn PDF document text
    • http://bidavotajowev.epizy.com/cbse_class_8_maths_rational_numbers_worksheet.pdfIn PDF document text
    • http://mejusamenubeto.rf.gd/navamadapezibekos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c0de26-2c35-4f87-8123-452a4b362082/toro_model_20332_belt_replacement.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_off0001400e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400E 5456 bytes
SHA-256: 354ba3e0859015cd861f0cbebffa3884c6f215cdf46f8453bd91e66dc4dd04df
font_01_sfnt_off000152b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B8 11412 bytes
SHA-256: d21a2c9511afe6654580f63dc64f2f7184ec586446a24612d11c06d360ddbd92

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