Malicious PDF — malware analysis report

Static analysis result for SHA-256 963c3fdb3a8b7b28…

MALICIOUS

PDF

75.4 KB Created: 2021-04-06 08:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e1a9e15323f8a18eb1e160042e653958 SHA-1: 623729a603049a8f4a1487f653f5bd7939c898b7 SHA-256: 963c3fdb3a8b7b28512f59c63c4b0f0fa3f59e4424fcc60d1892a0a43c4c6c27
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/award?keyword=class+a+b+ab+c+amplifier+pdf PDF link annotation
    • https://mesupajediruz.weebly.com/uploads/1/3/6/0/136051454/98c153.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/gebobipo_zovol_wusapoguv_dijesagesafuv.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/what_essential_oils_relieve_stress.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/lefakuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/HAhcCij/damigudawinami.pdfIn PDF document text
    • https://paxutujuwibe.weebly.com/uploads/1/3/4/9/134904532/sogogifewis.pdfIn PDF document text
    • http://sugakibabusu.scienceontheweb.net/agriculture_biologique_au_maroc.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/hg7Bzjg/bad_2_bad_extinction_premium.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/d9Ghajb/apple_knight_action_platformer_download.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/40463628be911e.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/zobuwubedak/antonin_artaud_jet_of_blood.pdfIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/soal_cfit_skala_3_bentuk_b.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/hungry_shark_evo_indir_android_oyun_club.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/kedonaru.pdfIn PDF document text
    • http://gixufedexakav.atwebpages.com/bread_street_kitchen_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/5e_character_sheet_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/74556998033.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/foxefumejebaditutiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/warriors_dont_cry_summary_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/institute_of_medicine_medication_errors_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/worewati.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_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 5344 bytes
SHA-256: f69282dfdcee3b25fd58cd7d3dddc98acddd7b5047ee259c16b6eea0816cf783
font_01_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 11344 bytes
SHA-256: be4b230512e466bfadd73e27f93429f80d9dee8449bb8a89bf7c16242ad64951

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