Malicious PDF — malware analysis report

Static analysis result for SHA-256 73addd0bd6bfa448…

MALICIOUS

PDF

78.1 KB Created: 2021-03-23 02:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 665ab6e7d1cd4a06c9ab614558d27d06 SHA-1: 20c0a67f6ea58992bebd6ecbc504117255ea3e3b SHA-256: 73addd0bd6bfa448d360c75db67043237e9f3814216fac6b02cadef7b8f4ede4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The presence of a URL with a 'utm_term' parameter related to 'windows shortcut keys print screen' indicates a potential lure to a phishing or scam site. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=windows+shortcut+keys+print+screen PDF link annotation
    • http://orbitan.fun/858304145189xwh6.pdfIn PDF document text
    • http://italiahot.fun/what_is_the_tulip_of_calvinismy9xry.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/ubyWHhf/kejafax.pdfIn PDF document text
    • http://logoped-samara.ru/nutrientes_antioxidantesoqp09.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/hiigJEz/54731974365.pdfIn PDF document text
    • http://2220202.ru/zijatadililosobopixg9n3i.pdfIn PDF document text
    • http://creditstar-kabinet.com/notarized_proof_of_residency_lettere6w3x.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/jebidjc/pusuxutuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_ab406bdca3f2481d9c222814367933ae.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_c56e51e267f84835a97c2f62c8f2ba61.pdf?index=trueIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_76132973057346d3adc1541bde47edc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad892f65-160c-4f43-8959-d3f903a346fb/la_metamorfosis_franz_kafka.pdfIn PDF document text
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_f5cf3da6cf7d4ae493a44d3c943ed616.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_2d8a252cf0ab4a64ae2f89b52511c5c8.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_6eafcf19020b41afa769e6b22cbce42b.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_28752d3524a64260ae17338419f7e9c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1187fad6-392f-4012-8fb0-0851cd14e190/the_pit_and_the_pendulum_analysis_questions_answers.pdfIn PDF document text
    • https://4ab51db4-2ab9-4ce7-8cf9-a7235cd4f8a6.filesusr.com/ugd/c6359c_e3045c328b6f450c8247fb13c76b5a7d.pdf?index=trueIn PDF document text
    • http://duvewukabiwetu.epizy.com/what_is_the_main_idea_of_click_clack_moo_cows_that_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34bf9c58-32d9-4185-8111-88d4867e18a2/how_to_write_a_statement_of_faith_for_employment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818b29ab-bded-4556-83f5-8c7094e99557/badepavaj.pdfIn PDF document text
    • http://kesobikifa.epizy.com/aacomas_transcript_matching_form.pdfIn PDF document text
    • http://vorawaforase.epizy.com/fojovafujitivadana.pdfIn PDF document text
    • http://dumevurofif.rf.gd/baldur_s_gate_enhanced_edition_apk.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_c1d025d9ffa049f59c2c32a61be9f852.pdf?index=trueIn 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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 5188 bytes
SHA-256: 8d14cac178c0ca396dd72bd046dca103611ba17770c4ecd5e4a15f6be3004edd
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 10980 bytes
SHA-256: 8c85397e25275234a3ac29f568a4b865defbb6573f3da160d4c4cac62b94140f