Malicious PDF — malware analysis report

Static analysis result for SHA-256 743152a77db4fe6c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-29 14:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b9bd9f2244102ee02b58fd7ba005ba8c SHA-1: e983a14a5bfa88f4e8652246ec4d84dfd32480f1 SHA-256: 743152a77db4fe6cc4bd10112e2fb3ea82065048b4699c1bba53d5867f0582ea
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=relative+pronoun+worksheet+for+grade+4 PDF link annotation
    • https://mesoxofag.weebly.com/uploads/1/3/4/3/134314287/lorurojikuvo.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/zobuvivoribodamutig.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/mitosis_of_an_animal_cell_answer_key.pdfIn PDF document text
    • http://vududodudo.22web.org/free_template_for_annotated_bibliography_apa_format.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/pengertian_bleaching_gigi.pdfIn PDF document text
    • http://saxefitipar.iblogger.org/freesports_freeview_tv_guide.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/a1c138a.pdfIn PDF document text
    • https://ziwuvofoxovexo.weebly.com/uploads/1/3/1/1/131163777/5719735.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/xedimepobino.pdfIn PDF document text
    • https://rarakini.weebly.com/uploads/1/3/4/8/134884681/lipewo_zigomegowade_jagasegufetoj.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/5828994.pdfIn PDF document text
    • http://tonozezoziw.iblogger.org/66339883466.pdfIn PDF document text
    • https://kokezixunilo.weebly.com/uploads/1/3/4/0/134096179/4676952.pdfIn PDF document text
    • http://tufepuwaw.iblogger.org/fusion_360_mac.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/xojipabemanugonesi.pdfIn PDF document text
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/wobebiromuki.pdfIn PDF document text
    • https://tedudizoz.weebly.com/uploads/1/3/2/6/132683188/niwuso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tibibexubedumu.rf.gd/add_2e_spells_and_magic.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/how_to_replace_thermal_fuse_in_kenmore_elite_he3_dryer.pdfIn PDF document text
    • http://jesebikalag.epizy.com/coldplay_viva_la_vida_sheet_music.pdfIn PDF document text
    • http://bozexefuj.epizy.com/wukafipuxukafusosove.pdfIn PDF document text
    • http://jojulupijawide.onlinewebshop.net/elementary_book_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/tarif_hotel_formule_1_epinal.pdfIn PDF document text
    • http://suvumudupese.epizy.com/3601631717.pdfIn PDF document text
    • http://zukepeva.rf.gd/ielts_general_writing_task_1_model_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 5496 bytes
SHA-256: 6351b767c74e3e81651570f5b5b12f577073b3afa435a972167e4cb875956d76
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 10248 bytes
SHA-256: b5fcdad2b3d842c1c046949d15cd70877b5e276d2c161699afb1f65d4fbc77af
font_02_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2