Malicious PDF — malware analysis report

Static analysis result for SHA-256 7911fc6371df090a…

MALICIOUS

PDF

86.4 KB Created: 2021-03-30 05:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c86a55236774af49ec823860ddd33405 SHA-1: dc0b766ee9a5257b48bfde24e3f97a2d31e4db86 SHA-256: 7911fc6371df090a9776de4b4cb3abe6c8b5516d7874ae85ded7d5f615894f60
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable domains and known malicious redirectors. The document body, though heavily obfuscated, contains text related to "Fl studio 12 tutorials for beginners", likely a lure to attract users. The heuristic firings indicate the PDF is designed as a link farm to distribute malware or conduct phishing, with critical detections for malicious redirector links and a general ML classification of malicious.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=fl+studio+12+tutorials+for+beginners In PDF document text
    • http://rebezun.mygamesonline.org/55019875036.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/technical_support_engineer_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/bebajasutarejen.pdfIn PDF document text
    • http://gafabotipunofu.mywebcommunity.org/wozufomafopobaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/i99xiao/pinetimogazomadaxaje.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/99351f38e5343.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/0xM7jeG/mujuxipovimirej.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/soloxo-pinin.pdfIn PDF document text
    • https://suxutusebosogu.weebly.com/uploads/1/3/1/3/131379987/tabopaxomuzen_nulemela_vixuselil_jowepipaxakewi.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/jgxKxjc/apple_mp3_player_how_to_download_music.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/free_catering_business_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ijajigg/14177853358.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/jbm49SJ/wofekubarotosapevesurabix.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/jgjdmAf/recharge_rc_apk_android_oyun_club.pdfIn PDF document text
    • https://wiwitubiz.weebly.com/uploads/1/3/5/3/135351816/lurozuzumi.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/0jhTqii/moto_camera_2_update.pdfIn PDF document text
    • https://cdn.sqhk.co/menekilebuz/hbJMAPO/crossfire_series_into_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_f5bc288cdf694ab5b211f6e62e2ca9da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/base_form_past_tense_past_participle_list.pdfIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_86096057f7d14df1b04bd29b9690f554.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/smartcentres_video_songs.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_70d63a31d036422389b0bb9600ba5f38.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_3c455815551e4732a8a20cb9eb7b902c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/43678864421.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/arciform_font_ttf.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_off000112d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D0 5356 bytes
SHA-256: 5a5558c400ff763f167484caf6e2bbff5249c48eaefd6c25d6ac072c70dce0dc
font_01_sfnt_off00012514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12514 10880 bytes
SHA-256: 2dbd32a4f908e7696fb5187776cbedd21b629a0354f528ef8242b075c841a2f9

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