Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7da1662383f3339…

MALICIOUS

PDF

74.0 KB Created: 2021-05-10 01:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 438e5939e169929f5fe0ee883fb19976 SHA-1: 97f015840ca98e09c9f13f8690b116c2595214d2 SHA-256: e7da1662383f3339c0b39845d61682ae54453a4b43f3e60d6233b78eb461845f
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded links, many pointing to disposable hosting and potentially malicious domains, suggesting a phishing or link-farming attack. The presence of external URIs and a link farm heuristic indicates an attempt to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://pelibifir.ru/strik?utm_term=how+to+fix+skyworth+tv+youtube PDF link annotation
    • http://postel-na-zakaz.ru/bostitch_f28ww_not_firing5axir.pdfIn PDF document text
    • http://detonic-hypertonie.website/36203317365kh6gp.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/understanding_pathophysiology_sue_huether.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/nutone_intercom_doorbell.pdfIn PDF document text
    • http://vizemezezu.sportsontheweb.net/neurological_exam_dog.pdfIn PDF document text
    • http://blue-tick-central.com/water_resources_engineering_related_jobs_in_indiau8frh.pdfIn PDF document text
    • http://tihefers.online/wamipukemavavozoxodapuzam65s9n.pdfIn PDF document text
    • http://bitcoins-profits.com/those_who_wait_upon_the_lord_esvpv4i9.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/e2ea8bae-644e-4712-ab34-4ae628129994/how_to_pass_the_vision_test_at_the_dmv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b4cfe9-6cd8-48f1-ac28-5bd105a18668/half_ham_oven_temp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b5bb10-7e13-4db9-a4aa-d160fdace3cd/rozominilakexutexek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a3acaf-5483-4f69-a4ec-2810ce57da7d/ikea_malm_bed_frame_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/spider_solitaire_2_suits_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f487b48-6178-4e66-b859-5bb83d173b6c/lg_dishwasher_3850dd3006e_door_gasket.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/24908368921.pdfIn PDF document text
    • http://nozozuwovore.atwebpages.com/bonidesat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b003bfb-c9cd-45bc-aae9-5fd51b2e2db8/html_templates_for_education_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23418cd-af0a-4673-8f95-94331e94f8ce/24501030008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1309892-290a-4d97-b211-b3bfecbd9079/20201483380.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/jugubumilobixer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba613a8-2744-443c-9bb7-5309a2dd741e/cissp_official_study_guide_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09eb35bc-053c-4f5b-9609-936f092833dd/what_is_the_term_for_a_female_warrior.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48090f58-a281-4a63-90ba-8819318fbaf0/whirlpool_dishwasher_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c87332e7-ae41-4373-b168-8ec634786159/ximokuverunovufutaz.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_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 5100 bytes
SHA-256: c155794aa78681e3ddda4aedd6085aa2494f9e8dc5e1531197ef82ec2a7aa64f
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 10932 bytes
SHA-256: 3fd8df91a62e61cffffd227d6a95456b0c403bf48d37721d2ae0bd1ce0b5b495