Malicious PDF — malware analysis report

Static analysis result for SHA-256 de648d91b1e43e87…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 23:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 602af1bc5481e077d450449fe91bec61 SHA-1: 9c2fc7f3e83aeda968ab7faab2b3aef2236cc060 SHA-256: de648d91b1e43e87ce69f6475e20218bbcb73ede9319bcb932496d4a600c4abb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://dafemum.ru/123?utm_term=bullet+head+2017+movie PDF link annotation
    • http://xozonline.ru/sony_ht-xt1_service_manualpgyq1.pdfIn PDF document text
    • http://online-bestshop.xyz/the_heart_of_darkness_full_moviekk00m.pdfIn PDF document text
    • http://detonic-official.website/neptunia_nep_nepdzmyr.pdfIn PDF document text
    • http://ubsvp.com/college_football_game_score_predictions_bleacher_reporthgfbe.pdfIn PDF document text
    • http://tumbochka.space/a_geek_in_japan_book_reviewnkdje.pdfIn PDF document text
    • http://dobikan.22web.org/jiveni.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/418b25702cc2908.pdfIn PDF document text
    • http://randname.ru/pamuminofavawlsisl.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/4531421.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/99b14698-40d6-4ae9-9a03-67ff8358bb93/12519067491.pdfIn PDF document text
    • http://rupadulogoliwid.epizy.com/is_a_research_masters_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cae53a-4c2e-4db9-b530-8c799658b24f/primary_one_mathematics_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2509fe2-52dc-4e15-8874-0e3ecd05b3b1/penufifedifuzivovawuzuder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ea8929-8f52-4c62-a00f-3de54c8d3b4d/8779970954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a342467-7801-4cfb-a006-5c16f0e0a309/how_long_to_cook_whole_chicken_in_air_fryer_rotisserie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c3c96c-cd9b-429a-b7f3-87f13e2537bc/4204207548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b197722a-98c5-45d3-8eda-869439f80268/67576564100.pdfIn PDF document text
    • http://xediguvodolej.epizy.com/tesla_model_x_spec.pdfIn PDF document text
    • http://zudovub.epizy.com/54095222345.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_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 5308 bytes
SHA-256: d80d830be943fa23e1b69bd0de88572949b90a4caeb4e871d9d3c86fcbde9e41
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 10736 bytes
SHA-256: 07122e7272b543c915be30ab7bad8bddbab2235f0d22ced4dc01bdc393e15d9f

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