Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae99b7d65b1ac83…

MALICIOUS

PDF

86.3 KB Created: 2021-05-01 22:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 240abb03ee2d8a3c7fb484e27a3b9006 SHA-1: 49c13b9a493e23dd9822e76e4a482ca92a25b97f SHA-256: 9ae99b7d65b1ac8381f534c2a6b300ae7a2908d5bad18227ff951aa5f49e215e
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various domains. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a high volume of links, suggesting an attempt to manipulate search engine results or direct users to potentially malicious content. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature, likely serving as a lure for phishing or other fraudulent activities.

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://kuzutuzo.ru/strik?utm_term=how+long+should+you+use+humidifier+for+plants PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482671/normal_5ffa267cc06af.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/gdygi2B/hybrid_homeschool_programs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/hihfijj/74201024268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_6038c9335b037.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/Dha3hd4/81802771405.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/gfGRja0/mupugoxanizuvoboru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450345/normal_601245bf3f224.pdfIn PDF document text
    • https://cdn.sqhk.co/tutogalubete/jaifAgc/autocad_2020_student.pdfIn PDF document text
    • https://leliwigozamik.weebly.com/uploads/1/3/0/7/130738568/6545462.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/0idqQxK/highway_rider_extreme_3d_motorbike_racing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/haPfxjv/93676367090.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/2082295.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/idXgdNn/48594085990.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/79fa89d8-5093-4869-8c81-69a368eb1b11/altered_carbon_cast_season_1_episode_1.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_f2384576154242f390678d68fdb74d7b.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_30f69fa6423a4143abad51d8948ffd32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90907138-5fca-49c6-9c47-3a33adb1ede4/8030320121.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_626c6f4a8f5543f5be710ea99ff81ae1.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_64afd19483ac462ca24c85eae52a2776.pdf?index=trueIn PDF document text
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_2259b1d69ed845f99c0d2bcfb314fbef.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5492 bytes
SHA-256: dfff2af1d9a29276d9a8b5059a9e08a490e1afb14670757be85b47ff005be83b
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 10748 bytes
SHA-256: f03b08df1a2497e88d5cefce088517f1540ea8cbcb02f42e5fd5c840ac1c4502
font_02_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 18464 bytes
SHA-256: 8e20326cd9f5e1c5cbdfe216181f52bef81caee6afb7c7555519edae267a8747
font_03_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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