Malicious PDF — malware analysis report

Static analysis result for SHA-256 187fb4e63f18edfd…

MALICIOUS

PDF

110.9 KB Created: 2021-03-07 05:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b3b53eec80f11f1237747cdae2b61a1 SHA-1: 89ae6efa8c819b36d21fd5497c09be1e0b106acd SHA-256: 187fb4e63f18edfdd31c4bda0a27c3ad050d9c55e3ae9b754b6ea126702efc8b
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external websites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://yafferge.ru/strik?utm_term=realidades+3+capitulo+2+guided+practice+answers'. The ML classifier also flagged this PDF with high confidence. The presence of numerous links suggests an attempt to direct users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=realidades+3+capitulo+2+guided+practice+answers In PDF document text
    • https://cdn.sqhk.co/bogovureg/dIgcjhl/economic_environment_includes_mcq.pdfIn PDF document text
    • http://cmb-accueil.com/tabla_de_integrales_y_derivadas_completa3v6fb.pdfIn PDF document text
    • http://copyrightshelpcenter.com/1593774055401tx6.pdfIn PDF document text
    • http://petersikdar.com/85581489930n6h52.pdfIn PDF document text
    • http://dkshlyap.ru/fododitizekijujeteroanfwc.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/hiicgeG/fisulegotozutafuzow.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/geSzid0/auto_answer_whatsapp_call.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_f845369e2db14e51acd777e7689ddefa.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_110523d0adbd42299bd3e404805aad5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/tricep_kickbacks_proper_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80db9ccb-b75a-4dba-8f70-b793488f1824/6479326980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cda0b25-acb9-4ea0-9be1-0fb8f9b66954/what_is_synthesizing_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a48e3e-58a0-4b7d-a7d1-a175e9915d8b/how_to_form_a_prepositional_phrase.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/boston_university_law_509.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_89b3a9286ef243aab951a9b7655900ff.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_7ca5b01e434446a3ae68d2c57b960d9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/articulate_storyline_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/duzoxivawi.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/kilapukedisubijem.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/laramie_project_play_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aaf8ce0-23e7-4b7a-8fcf-4acaad3b545c/how_to_program_my_directv_remote_to_my_yamaha_receiver.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/how_to_change_refrigerator_light_bulb_ge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614947bc-5935-4056-bb3a-fbcbe57d9fb8/tp_link_n750_factory_reset.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_f40a0197380947349965a14cc218a299.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000157ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FF 5068 bytes
SHA-256: 427ed4e95f6e103c2564abbb2db78eb2c6215e0146902fc08532b95f2f7994f9
font_01_sfnt_off000169a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A3 5636 bytes
SHA-256: 4667dadd39675b4cab7b8e84ad2c845e23b0dcb43de60eaf4a615c7df00de2f2
font_02_sfnt_off00017cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFC 14308 bytes
SHA-256: dd0bc7d607291e038495aa81d2dea5563793609e3094bc778255be48bb661bcf