Malicious PDF — malware analysis report

Static analysis result for SHA-256 1856c31a0074363f…

MALICIOUS

PDF

95.9 KB Created: 2021-03-20 19:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e8434519ba92f2d81f8eb71f0a626950 SHA-1: da33cdb0beaf41ea87eae468284268257ba4b6e4 SHA-256: 1856c31a0074363fadeaf462455c8a6198b1f061a429102f1ce1959421e20fdd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to academic topics, likely used as a pretext to disguise malicious links. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://resalured.ru/award?keyword=periodontologia+clinica+carranza+decima+edicion+pdf PDF link annotation
    • http://sizuxofutitarax.mypressonline.com/relations_and_functions_worksheet_algebra_1_answer_key.pdfIn PDF document text
    • http://oyuncuxx.com/howard_anton_linear_algebra_11th_edition_solutionh5f41.pdfIn PDF document text
    • http://fb-ig-copyright.com/dodigetebemlrrvw.pdfIn PDF document text
    • http://ritual-venki.online/elementary_linear_algebra_solutions_manual39w6e.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/pre_calculus_grade_11_module_free_download.pdfIn PDF document text
    • http://rasprodavaika.ru/what_is_color_temperature_in_ledr4gc9.pdfIn PDF document text
    • http://raifaisentapp.online/examples_of_punctuated_equilibrium_in_public_policytwmy7.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/77204323426.pdfIn PDF document text
    • http://okrasote.info/when_does_after_we_collided_movie_come_out_on_netflixhlyyy.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/9099560873.pdfIn PDF document text
    • http://podarokinsta.online/elkay_drinking_fountain_parts_near_mequnn1.pdfIn PDF document text
    • http://reduslimitalia-official.website/the_pitbull_biblea4bg6.pdfIn PDF document text
    • http://ttop-shop.com/mercury_9.9_4_stroke_manual7fn6h.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/3640464e-b7cd-419a-b232-d1b6c50bf896/21674965534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8dc966-4dc8-4045-ab92-3ad7b604a866/sirow.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_42da612f003d4d09bf22b819eb222e6f.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_8ad27c8548614e7da883159c5372a177.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd878a32-ce49-4292-ac38-e27f599f615d/93062105792.pdfIn PDF document text
    • http://lufopudizomuv.atwebpages.com/how_to_calculate_faster_without_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71902b7-ef46-4def-aafc-7594473ed3e8/loser_jerry_garcia_chords.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_6bc3618e8ce5450b9fddb6bbbd55b980.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be361a21-81b3-4345-9d07-b19e7ff52fc1/how_to_draw_a_autumn_tree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744df911-a031-4aed-aba0-2b08de2ef532/what_are_the_characteristics_of_a_game.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_7be4beb3226e489b83341bd5921206df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a94b7f-9493-4951-8ee9-47faa419bd3b/95683854216.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 3256 bytes
SHA-256: 266ce053f6cf51ef2ac76e56882f5ce229daca27bac7d01ba795bd2b427e04ca
font_01_sfnt_off000134dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DC 5348 bytes
SHA-256: 8ca68515547a5e428f1ee4d37d4b413494039ca8897d9c9d79e1abeba6060c88
font_02_sfnt_off00014704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14704 12368 bytes
SHA-256: 056ab7f54b808e521f8ca25580490934ec80e116127d21291c033be699ddbf6c

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