Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49aecbca11f83fa…

MALICIOUS

PDF

73.5 KB Created: 2021-03-06 23:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0041ce9c28554ba59b2cc0abcb409613 SHA-1: 023e9e38023a2e16db520e351ee25321f1e7945e SHA-256: b49aecbca11f83fa2e06cce6e5a122f883e8af2102895a4ef949096454ba2f87
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/123?utm_term=detailed+car+coloring+pages+for+adults PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420031/normal_6040595686232.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/LJzhhhd/naziref.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/napemivajazenutajifatubim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5fe631e1a8b7c.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/48917388927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_5fdb715ea2e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479921/normal_5fd2cc3c95a1e.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/hiibjiL/aquarium_fish_depot_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/cYjjitW/vocal_cords_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/67IjauX/mini_motor_racing_x_metacritic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_600c9d323ccbf.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/lee_child_short_stories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/accountant_report_for_solicitor.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/jatekaregis.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/how_to_download_bpsc_admit_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01f0910-3de3-4a5b-bbda-84d2b75175d7/39902659838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdcbdb4-8c5c-483b-a009-c190fd08c566/guess_brand_logos_level_200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc07ea1-1464-4fc0-a2af-2a98cff2b42a/dnd_5e_bard_subclasses_unearthed_arcana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f506531-9eef-4a5c-a86e-1703614e1027/mazufegedepiworan.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/batters_box_template_pvc.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/6269135980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91053b18-a10c-4d67-ad84-3e0c7a5a5fa8/naledosuxazabazat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa14b9b-e5a3-47f2-8fef-5d0fc556d820/dipuzebejazijax.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/dance_academy_movie_songs.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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 5320 bytes
SHA-256: 355f95287fde86caceb8917c881ee39ad62f3d24243b4355d422021df4150f89
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10892 bytes
SHA-256: 5666be1eb091f119394d151f1ddde9c3a856fb2de1efb34ace26cce970d18c92