Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f9b650bff5c0a6…

MALICIOUS

PDF

76.6 KB Created: 2021-04-18 10:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4937725cf96ec50979a23fff0fa7516d SHA-1: 293113f75967c3a7fb8db4d9529747635518d502 SHA-256: 55f9b650bff5c0a606cf44a8614aa0edbc98c26b55b9463e74c5be78c0cf1551
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as a phishing trojan. The PDF contains a significant number of external links, indicative of a link farm or redirection to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=the+odyssey+book+9+discussion+questions PDF link annotation
    • http://favarivizuna.medianewsonline.com/cambridge_academic_english_advanced_teacher_s_book.pdfIn PDF document text
    • http://juzirafotiwiwa.iblogger.org/213621030.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/las_7_bellas_artes_definicion.pdfIn PDF document text
    • http://roxanuveguwiz.22web.org/half_vampire_5e_race.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/tizafuwodipagazudot.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/how_do_electronic_fuel_injectors_work.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/fivejirutilazabidiwunel.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/jifedefujodu/19784189100.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/37202917745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c707cbc-2582-4cf2-9ad3-669e2ec41045/vw_bus_transmission_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/converting_measurements_worksheets_with_answers.pdfIn PDF document text
    • http://gusagokasu.epizy.com/59158482857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd367eb-530f-4d9c-af1f-f0749a556fea/the_word_of_god_is_living_and_active_bible_verse.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_3f922b731e2541c6a4e3475b11cccfd3.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_d288731d4a1a4036b6e3e207d32bde87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/005ae51a-73c0-488f-8312-0d4663485ef5/9820101947.pdfIn PDF document text
    • http://wubonaxe.epizy.com/set_background_colour_java_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1510526-eb8a-4564-b561-21a351940017/21_day_sugar_detox_diet_plan.pdfIn PDF document text
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_2579f0cff7824a64b8fc0da3449bdfbb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/lirajakujoxaparatobas.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/how_to_make_a_delta_loop_antenna.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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 5224 bytes
SHA-256: 41f60a07dca19a2fdd2319c3a311a1063babc531bad658e2780c8da94fa9f8b7
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10608 bytes
SHA-256: f8ecf086ff6499ce607b19823078d187b6a915668e22aad02b621d2ee2d1a0ce

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