Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b555f0f97471058…

MALICIOUS

PDF

75.7 KB Created: 2021-04-27 19:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 11098cfdf7f1e5d1ad466e08dd2372b5 SHA-1: 2126489987f43e0565afababd0dc0bb7ad993baf SHA-256: 5b555f0f9747105851f57e4d4a87eca310e578674d7bdf738966be3bef965b02
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The primary malicious URL identified is 'https://gimoguvi.ru/strik?utm_term=how+to+know+if+golf+cart+battery+charger+is+working', which is likely used to redirect the user to a malicious site. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=how+to+know+if+golf+cart+battery+charger+is+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470964/normal_60586f0fde3d9.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/zqLjdRV/723187875.pdfIn PDF document text
    • https://cdn.sqhk.co/kazakilen/ghdY1mu/quran_audiobook_english_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/TWgfgOO/7731715606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404727/normal_605e008e0ad94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_605f5259197b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495837/normal_5fc7e867be516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fda48cab4718.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/jfFZWgh/best_songs_of_john_farnham.pdfIn PDF document text
    • https://cdn.sqhk.co/sedelake/jMjjvhd/periodic_table_worksheet_word_document.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/aClidbM/gapekilisavug.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/figjeXO/fijetamunazu.pdfIn PDF document text
    • http://wenaparufikunon.22web.org/breviario_romano_en_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_604b0d4b6065e.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/fd5a9c91-6a0d-43bc-bd6a-c7ee2add74d1/kidde_smoke_detector_battery_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8ab37d-6f97-4fb6-b9f1-6257566c233a/17909522256.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/how_to_make_ham_with_ginger_ale.pdfIn PDF document text
    • http://rufofexejojar.epizy.com/58475147705.pdfIn PDF document text
    • http://gubadix.epizy.com/creating_checklist_forms_in_excel.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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 5504 bytes
SHA-256: 5b1cbfeabcc1d5308ffbb90cc1b27d4cde9c6b88f35c2c10711ea80306975a9b
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 10772 bytes
SHA-256: e1e7c6253cbed5b0391db194c99c9e876a7149636def58e4fb1e35ca0f90a862

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