Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7c913838d6f1ee…

MALICIOUS

PDF

73.7 KB Created: 2021-02-28 12:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 143530d4bc80e4dfe9e874a4c3f2ded8 SHA-1: 3a9acf12b320b7fa714d6b1d9650b3831ab7a726 SHA-256: 5a7c913838d6f1ee27ac0ccd2eb03fa004ddfe31ba04a33e87ae79eea6b59a63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=how+to+make+a+balsa+wood+bridge PDF link annotation
    • http://denizan.com/easiest_song_to_play_on_acoustic_guitar_evermjuwo.pdfIn PDF document text
    • http://discount50it.pro/blood_of_elves_summary2ftni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477892/normal_5fdf248543f39.pdfIn PDF document text
    • http://floradoma.net/always_on_display_vivosziva.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/xoritanuzezojogo.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/cinderella_solution_main_booklkjoi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377909/normal_6008c09119aa7.pdfIn PDF document text
    • http://lessonsonline.site/gilazajaa07p1.pdfIn PDF document text
    • http://disconto50.pro/21937837852sbi47.pdfIn PDF document text
    • http://morj.space/sexiest_fallout_4_mods_xbox_one_2020v7284.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/libro_cien_aos_de_soledad_de_que_trata.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/kagetadetedogavir.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/how_to_use_ipad_for_teaching.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/vavapekadoliti/43230077226.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/78648931743.pdfIn PDF document text
    • http://vedewujesog.rf.gd/arabesque_1_piano_sheet.pdfIn PDF document text
    • http://dibiremiva.rf.gd/xusatazujinelosasopawokes.pdfIn PDF document text
    • http://devisufuxuvit.epizy.com/26872682511.pdfIn PDF document text
    • http://vevubajiziju.epizy.com/achtergrond_foto_verwijderen_android.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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 5404 bytes
SHA-256: 125998418af901bfb6c445de4fbde4621975a2003b1c3570f7206246f5c21925
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 10040 bytes
SHA-256: 3e7bfc92eb8927dc855cd59cd40310697fd52cac06a9044da1a81ec15ee86077