Malicious PDF — malware analysis report

Static analysis result for SHA-256 492ffba776eae99b…

MALICIOUS

PDF

103.8 KB Created: 2021-04-05 17:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eac3baa0b9f132ae93e7e9043073768e SHA-1: d901ea18efcd4f4359afd3f22d042d9e05e361bb SHA-256: 492ffba776eae99b20ebc016dc22a8a1874278a87f92f44dfba71a9b781ca4cf
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. An external URI pointing to 'jumiwimov.ru' was extracted, which is highly suspicious and likely serves as the primary distribution point for a malicious payload or phishing content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'cardinal numbers list pdf', suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=cardinal+numbers+list+pdf
    • http://gitilapen.66ghz.com/rock_metal_blogspot.pdf
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/5f4032.pdf
    • http://xomofaki.getenjoyment.net/36840681324.pdf
    • https://bodupojuribun.weebly.com/uploads/1/3/4/7/134758420/9626469.pdf
    • http://vagivosifogezer.22web.org/what_are_the_different_parts_of_a_circle_and_their_meanings.pdf
    • http://mavogevuz.getenjoyment.net/gate_mathematics_questions.pdf
    • http://gizovivomiz.getenjoyment.net/little_chief_smoker_recipes_salmon.pdf
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/6e8b5e947d43b2d.pdf
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/dc27619a9.pdf
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/tegizemu.pdf
    • http://kiwufaninini.22web.org/sefovawemamukam.pdf
    • http://dapajurop.mygamesonline.org/miwonarasakejeg.pdf
    • http://tasusala.iblogger.org/what_is_the_best_security_system_for_business_purpose.pdf
    • http://wirobigi.medianewsonline.com/8238735605.pdf
    • http://mujudesuxiropa.sportsontheweb.net/descargar_libro_de_geometria_y_trigonometria_de_conamat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fesejawezu.rf.gd/broom_2020_effective_public_relations.pdf
    • http://nugafafekovad.epizy.com/gmat_official_guide_2017_ebook_free.pdf
    • https://uploads.strikinglycdn.com/files/2505c61e-3d4a-4e34-89b1-117504cae990/mosbys_canadian_manual_of_diagnostic_and_laboratory_tests_2nd_edition_free.pdf
    • http://xusoloturokuk.epizy.com/tapujixetedezililonatime.pdf
    • http://bodudenijijeb.onlinewebshop.net/phn_mm_ct_ghp_file_online.pdf
    • https://uploads.strikinglycdn.com/files/0c4a3ba0-8382-471e-9c48-c1dba98b052c/how_to_stop_splat_hair_dye_from_bleeding.pdf
    • https://uploads.strikinglycdn.com/files/91f64564-7f4c-48f4-be24-bb433e3566e4/delonghi_lattissima_one_capsule_coffee_machine_white_en500w.pdf
    • http://dedeseb.rf.gd/pharmacotherapy_a_pathophysiologic_approach_test_bank.pdf
    • http://nofolimuri.myartsonline.com/fusujekedopenamenule.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001529e.bin
1b8ac8b3d83d5ccd5d5d33fa0995f69c78564e7c7853a359d9b33541f8ee4d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1529E 5232 bytes
font_01_sfnt_off00016444.bin
95d578c16ed09a7431af8129d7e8465033640cd0184360960e45872044b88e66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16444 14776 bytes

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