Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b7c391986e1e9a…

MALICIOUS

PDF

75.3 KB Created: 2021-03-02 18:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e2500b652b14b31dbe082840f00a3bce SHA-1: 0ea2250c8a10cb3b10e556ff4dac4e72ac0962ca SHA-256: e5b7c391986e1e9a2cc33571ae78ef6a4b4586b78f4c9e862bd1dfe9af3dd5d8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and configured with UTM parameters, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=is+percy+jackson+on+netflix+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418579/normal_5fd810740dd8c.pdfIn PDF document text
    • http://texewofe.22web.org/google_sheets_averageif_0.pdfIn PDF document text
    • http://zopetiwan.22web.org/70522706794.pdfIn PDF document text
    • http://sodalabs.pro/accelerated_reader_test_answers_for_hunger_games3m0h9.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/f7haNid/bupokozawibabopibiti.pdfIn PDF document text
    • http://podarokinsta.site/lulidejevijabaninivazavoxd4ioj.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/jamjbLX/hokey_pokey_meaning_in_tamil.pdfIn PDF document text
    • http://axecheat9.xyz/stock_exchange_brokers_in_canadaezb7f.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/Jhjiihg/58620094189.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revuzulikasulo.epizy.com/mp4_agnes_monica_tak_ada_logika.pdfIn PDF document text
    • http://zabuzuko.epizy.com/93376290719.pdfIn PDF document text
    • http://ditufadupogeju.epizy.com/7113530838.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_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 5528 bytes
SHA-256: 40b1db8682ffefafec0442d51cbf2982056d776d58fb761fad6a8c55bb5dcd19
font_01_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 11264 bytes
SHA-256: cd4cda7f2145f087a17f6cdf9b59ec101d67647e982ebdda3bd004b9c1f64cc9

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