Malicious PDF — malware analysis report

Static analysis result for SHA-256 8889f0b9e2ba3f19…

MALICIOUS

PDF

104.9 KB Created: 2021-04-14 23:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7c39f7991410d573f3926730f98264f4 SHA-1: 7cef9ced0622ce3caeaebc8294f419281970c085 SHA-256: 8889f0b9e2ba3f19f2d119dfe185b286c2de08dd06b867cd7ddd26aa9f65e7bb
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming by redirecting users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=sex+education+season+1+plot PDF link annotation
    • https://sibanozaniso.weebly.com/uploads/1/3/4/8/134858677/3c53f3b75101.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/icidmif/kawisezagowotojefetuwofuv.pdfIn PDF document text
    • https://palanufijerovas.weebly.com/uploads/1/3/0/7/130739221/wekijufefevajuleduv.pdfIn PDF document text
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/6866146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_60675b741c879.pdfIn PDF document text
    • http://redirerer.medianewsonline.com/gesezogadejapawufovevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_5fdc54730b07c.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/bepilujuruw-pozuwuzif-ketebexu-juvevujadoduv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_5ff7628b7b7aa.pdfIn PDF document text
    • http://poruzotosiku.getenjoyment.net/xaledipenuzegi.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/MgitggA/game_screen_recorder_with_internal_audio_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/cMjjjaZ/comparisons_in_spanish_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/mqjhhd6/31663074284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462993/normal_5fcdfa71e3fb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/sekil.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_31871533dcd2443e8d613fb7d1a9839e.pdf?index=trueIn PDF document text
    • http://mixezized.myartsonline.com/operations_supply_chain_management_14th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/city_building_games_apk_mod_offline.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_c1335dcb1bb54ec5ad9ba2a0abde3d21.pdf?index=trueIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_f25e6882bbd845b7b8b19776143f5005.pdf?index=trueIn PDF document text
    • http://lajovaputap.myartsonline.com/ronipidepexagizimeto.pdfIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_7fd9f96eca0a48bfb7a483e01ab27ce5.pdf?index=trueIn PDF document text
    • http://nowimirozox.atwebpages.com/lodokamapevorafizaluz.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/the_secret_garden_movie_1949.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_off00015d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3D 5196 bytes
SHA-256: 02cfa31532d03350a6bd11b02b70944ab6b03cf4a31e5664c10fb73f70db0941
font_01_sfnt_off00016f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0A 11484 bytes
SHA-256: 8e8e35fd7b8ee3a796f31dc49ab9480a4d0343fc1b9c14a9381a882bad787ed0