Malicious PDF — malware analysis report

Static analysis result for SHA-256 a324d7ecdbb979eb…

MALICIOUS

PDF

81.7 KB Created: 2021-04-03 04:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b140a3b967623390b1907bdc314f9121 SHA-1: 2275ef1afbb0c3e4504264c65bab76cce0d521c6 SHA-256: a324d7ecdbb979ebdd0823afede428ae86713f9b4778deb720d004a2164f9917
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically leading to a link farm designed to host multiple PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to snow blowers, suggesting a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=best+single+stage+snow+blower+under+%2524400 PDF link annotation
    • http://vugekowuzujed.scienceontheweb.net/ketogenic_diet_meal_plan_free.pdfIn PDF document text
    • http://genusadnlo.space/xeluxalokatabexorewaxexi0pdsy.pdfIn PDF document text
    • http://extrameets.fun/anjathey_tamil_movielvmta.pdfIn PDF document text
    • http://findssldz.xyz/pufebofowewadunukuxakogo8l8fd.pdfIn PDF document text
    • http://avto-document.site/fuvifeduxawexuj2ec14.pdfIn PDF document text
    • http://disclosures.space/29553758999d405u.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/africa_political_map.pdfIn PDF document text
    • http://study-english-05.site/tavofebnyeo5.pdfIn PDF document text
    • http://shoop-fn.ru/sunless_citadel_fortress_level_mapps6t0.pdfIn PDF document text
    • http://lovechat24.club/auditing_assurance_and_ethics_handbook_2020ytve2.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/10137729762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gavawekib.myartsonline.com/the_economist_24_november_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092f3ab5-90ea-4860-bc04-8057d53d89f9/libro_fisica_2_bachillerato_santillana_proyecto_saber_hacer.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_59a29d50260c42f492e8b21c5879055c.pdf?index=trueIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_3fc74f48b0e54303a1de490788ad7153.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bed665-a56e-46e4-a7bd-6ba1385c0203/5625171959.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/what_is_wd_tv_live_streaming_media_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213fc019-56d8-48a6-bd81-28ab73ecd64c/what_is_the_most_advanced_math_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4404189-ffd1-4cf6-a93c-8addc6530014/81762929455.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_5e0d7ea9f96f47208e14535f2937b533.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/thakurmar_jhuli_bangla_cartoon_mp4.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_3aa1e1c937cb4fe7b108356f60b917db.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_0447661ce9044217be73b4b669d0128c.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_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 5740 bytes
SHA-256: 1bf8bef257c394d6f711b12654b9a185c1bbb5d50ddd3d6f048fc0115d4eceeb
font_01_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 11072 bytes
SHA-256: f154c27124399dd0164302d92e2297aa06fbeb7f80c79c8bc7e23133d237b681