Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33d1fce05d639c1…

MALICIOUS

PDF

70.2 KB Created: 2021-03-18 15:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 27613b70611935cfdb068f7898e6100f SHA-1: ae40ff5ad1062c250598d5c1a66be97e8c96a62e SHA-256: e33d1fce05d639c1713d288c8a8d484179abf9f3a241414b72075241233025d7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic. The primary URL points to a keyword-laden page, further supporting the SEO spam hypothesis. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially malicious or unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=hot+wheels+ultimate+garage+shark+instructions PDF link annotation
    • https://cdn.sqhk.co/sakupiraf/4hhLaa1/ultimate_offroad_simulator_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/ghidWjg/game_zombie_frontier_2_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_604ab9fe9c29b.pdfIn PDF document text
    • http://hairhome.moscow/what_is_shinranavnyp.pdfIn PDF document text
    • https://paxupodef.weebly.com/uploads/1/3/4/7/134763896/be623b1e884772.pdfIn PDF document text
    • https://cdn.sqhk.co/vovidonob/uyxUgdd/no_limits_night_racing_facebook.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/pisibedobitufube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_5fdc368d6caac.pdfIn PDF document text
    • https://tunizobun.weebly.com/uploads/1/3/1/0/131069832/beae234e82ff.pdfIn PDF document text
    • https://gikuxowatevu.weebly.com/uploads/1/3/2/6/132681634/lolifuzijupubekisewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_6011510a0ae99.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/GDUaTgc/super_vpn_apkpure.pdfIn PDF document text
    • http://znakomstva18x.site/english_grammar_corrector_free_downloadvxyyb.pdfIn PDF document text
    • http://onlinesos.tech/get_unlimited_likes_fans_for_tiktokw3z81.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/ege9jie/jonah_hill_road_trip_movie.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/277893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_602ce090510d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_55b69d2735974d3bb32f24864032107d.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_466a980a2cb04971a906f67e5cd36e61.pdf?index=trueIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_660481e4c67348d995c1c736c5f26aea.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_2f3bc9832f22477aa07308cc7d33946f.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_f78b5fce1dbf4f678aab21e539f1febd.pdf?index=trueIn 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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 5332 bytes
SHA-256: cd6f92741e3b2a6575efc1e7bf7267b1a3e045e0f88e67eae7b927e34f35446a
font_01_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 10080 bytes
SHA-256: 1f11fa1e38722a5d160cebb6c8d0c691b68202c9c7fc7c24fea4e0ffb4e9017a