Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c12f33fff20414…

MALICIOUS

PDF

86.7 KB Created: 2021-03-16 01:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 533142439f7e0548f9dfaa7752b326f4 SHA-1: 259b5885048509428de3916b1048930c31356ca7 SHA-256: a8c12f33fff20414c8d3623bb82cb3eee6ce10eed4ab2268365644546e820f11
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains, with the primary URL being 'https://soxebez.ru/wix?keyword=rapid+cash+las+vegas+nv'. The document's structure and the presence of many external links suggest an attempt to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/wix?keyword=rapid+cash+las+vegas+nv PDF link annotation
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/9bf502acb61b150.pdfIn PDF document text
    • http://biwejobezimije.22web.org/surikutenefusabukokeweze.pdfIn PDF document text
    • https://cdn.sqhk.co/zujagepax/chiBBji/buddha_hoga_tera_baap_songs_320kbps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fc95da55914e.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/9jgKJif/cardiology_guidelines_ppt.pdfIn PDF document text
    • http://bunnygummy.ru/fumadopxk8eo.pdfIn PDF document text
    • https://xekexudaxojow.weebly.com/uploads/1/3/4/3/134365032/d28039f639f.pdfIn PDF document text
    • https://cdn.sqhk.co/dopinaku/e9haVjj/samsung_galaxy_s4_live_wallpaper_apk_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fc56f302d034.pdfIn PDF document text
    • http://wisomudo.iblogger.org/working_capital_management_policy.pdfIn PDF document text
    • http://hookup750.website/abviewer_12_cracknci32.pdfIn PDF document text
    • http://kdghy.online/excel_vba_if_sheet_exists_then6vew9.pdfIn PDF document text
    • https://kebufuwotum.weebly.com/uploads/1/3/4/0/134040355/665ba4c8b1.pdfIn PDF document text
    • https://pasadaxadug.weebly.com/uploads/1/3/5/3/135390708/kugazar.pdfIn PDF document text
    • http://mifvideo.space/70441142892y9ovd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5fdddd4919980.pdfIn PDF document text
    • http://videohost.space/how_to_play_usb_on_jvc_tv0u5pi.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://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_de9fccb3e77b42c3b287562d2c45ce65.pdf?index=trueIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_cbad40aec6be4ed884fe5eb08f5f7c71.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_841f29d3518c466f9301a9be8670032b.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_8428f79bb25945c6a0df420c0134570a.pdf?index=trueIn PDF document text
    • http://refiwamidur.rf.gd/living_room_coloring_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 4904 bytes
SHA-256: ba125ef89c2dadd05fc5939dc94598ba1d7342c21441a6ac06aa60f0f9a509fb
font_01_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 11464 bytes
SHA-256: 16ea0a72ce0cc82dc7f6e091a5db66edb21b99a85479d372b00d142ca70b8acb
font_02_sfnt_off00013f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34