Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50e6ea95b030817…

MALICIOUS

PDF

95.5 KB Created: 2021-06-02 15:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d911995ee3f507ec01a81bc1482f953d SHA-1: c27c52da7d54cdfc7f62ee139d9259d5ce5667d4 SHA-256: e50e6ea95b0308171948db3c71997ef07fac3886b469ee658ebc9f600bc2e355
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, including one pointing to 'crysiq.ru', which is likely part of a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a malicious intent. No scripts were extracted, but the overall structure and URL findings point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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 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://crysiq.ru/pbw?utm_term=all+shortcut+keys+of+excel+2007+pdf PDF link annotation
    • https://keroxoxelesiz.weebly.com/uploads/1/3/1/4/131452869/9712749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_60152f8e5bb93.pdfIn PDF document text
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/896408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_60597218ce090.pdfIn PDF document text
    • https://mokomopepu.weebly.com/uploads/1/3/5/3/135333670/5334399.pdfIn PDF document text
    • https://fosozofafeg.weebly.com/uploads/1/3/1/8/131856121/wononiwikurafe-wakag-sedinisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_601601772ceae.pdfIn PDF document text
    • https://zozesikijep.weebly.com/uploads/1/3/4/5/134586683/a56933eed0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144507039/dimurarozadijuveluwe.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/f/81401466532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8cd5daf-49ae-4779-b836-b721e5d216bd/brother_hl-2270dw_printer_toner_cartridge.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/coin_master_hack_app_link_free_spin.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144437415/descargar_mdulos_de_modalidades_flexibles_octavo_grado.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144487437/mcgraw_hill_connect_financial_accounting_answers_chapter_7_homework.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/instagram_followers_increase_app_neutrino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e82d030-3186-4f7f-8250-a0e6b50dabdc/sipasuvinibewodamij.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144498288/free_printable_high_school_transcript_template.pdfIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144422994/56787617088.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/w/file/fetch/144495345/as_vantagens_de_ser_invisvel_filme_completo_dublado_mega.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144501714/what_is_the_icd_10_code_for_anoxic_brain_injury.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbedc33-7d59-408c-a354-686bb8eb945e/kevitexusuvowaroko.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144507129/94494808276.pdfIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144471093/english_alphabet_handwriting_practice_book.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/lezuxabisifoge.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/f/xifamutelajerivoxabive.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/foroselerekes.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_off000131c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 5612 bytes
SHA-256: 3df927be0836d33ad50d8a330c33fdeb8e2e0be1214b906681ff678db9180a1f
font_01_sfnt_off000144f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F2 12912 bytes
SHA-256: e7639d9fb8e0a1ef8b35381587444cda7f8be07e44ae0fb88a1f8ce0e0556055